Pub Date : 2018-09-04DOI: 10.1177/204124791800900203
Ravindra V. Gadhave, P. Mahanwar, P. Gadekar
The Increasing global energy crisis and scarcity of petroleum resources has shifted the focus of the hemical industries to look for alternative raw material resources. The main focus of raw materials in wood adhesives, such as petroleum and natural gas [1,2], would be gradually replaced by renewable bio-resource polymers. Starch is a relatively an inexpensive and renewable product from abundant plants, easy processing and it has been extensively used as paper binders, sizing materials, glues and pastes [3], but its bonding capacity is not strong enough to glue substrate like wood, paper. Conventionally available wood adhesive emulsions are colloid like polyvinyl alcohol stabilized. A new research on biodegradable, renewable, environmentally friendly starch stabilized polyvinyl acetate emulsion that was synthesized by the graft polymerization of vinyl acetate onto starch. In this paper, we reviewed starch as colloid for synthesis of polyvinyl acetate emulsion.
{"title":"Starch Stabilized Polyvinyl Acetate Emulsion: Review","authors":"Ravindra V. Gadhave, P. Mahanwar, P. Gadekar","doi":"10.1177/204124791800900203","DOIUrl":"https://doi.org/10.1177/204124791800900203","url":null,"abstract":"The Increasing global energy crisis and scarcity of petroleum resources has shifted the focus of the hemical industries to look for alternative raw material resources. The main focus of raw materials in wood adhesives, such as petroleum and natural gas [1,2], would be gradually replaced by renewable bio-resource polymers. Starch is a relatively an inexpensive and renewable product from abundant plants, easy processing and it has been extensively used as paper binders, sizing materials, glues and pastes [3], but its bonding capacity is not strong enough to glue substrate like wood, paper. Conventionally available wood adhesive emulsions are colloid like polyvinyl alcohol stabilized. A new research on biodegradable, renewable, environmentally friendly starch stabilized polyvinyl acetate emulsion that was synthesized by the graft polymerization of vinyl acetate onto starch. In this paper, we reviewed starch as colloid for synthesis of polyvinyl acetate emulsion.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791800900203","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42652541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1177/204124791800900202
Mahuya Biswas, Abhijit Pal, Munmun Dey, Ayan Dey, A. Bandyopadhyay
In our present work, we have attempted to develop a low volatile organic containing, ecofriendly resin from a natural resource maintaining the quality and desired properties for printing ink applications. Guar Gum, a natural polysaccharide was used in place of pentaerythritol in the recipe. It was used during trans-esterification reaction to synthesize rosin modified phenolic resin for printing ink. A conventional rosin modified phenolic resin, using pentaerytritol, was also synthesized for comparison. Guar Gum having multiple hydroxyl groups was able to produce resin with higher molecular weight and high solvent tolerance value which makes the ecofriendly resin as potential binder for printing ink application with excellent print quality. The modified resin was characterized using various analytical techniques to find the influence of the polysaccharide on the final properties. A detailed kinetic study was also carried out in order to justify the reaction mechanism.
{"title":"Influence of a Biobased Reagent on Properties of Industrial Resin for Printing Ink Application vis-à-vis Comparison with Standard Commercial Resin","authors":"Mahuya Biswas, Abhijit Pal, Munmun Dey, Ayan Dey, A. Bandyopadhyay","doi":"10.1177/204124791800900202","DOIUrl":"https://doi.org/10.1177/204124791800900202","url":null,"abstract":"In our present work, we have attempted to develop a low volatile organic containing, ecofriendly resin from a natural resource maintaining the quality and desired properties for printing ink applications. Guar Gum, a natural polysaccharide was used in place of pentaerythritol in the recipe. It was used during trans-esterification reaction to synthesize rosin modified phenolic resin for printing ink. A conventional rosin modified phenolic resin, using pentaerytritol, was also synthesized for comparison. Guar Gum having multiple hydroxyl groups was able to produce resin with higher molecular weight and high solvent tolerance value which makes the ecofriendly resin as potential binder for printing ink application with excellent print quality. The modified resin was characterized using various analytical techniques to find the influence of the polysaccharide on the final properties. A detailed kinetic study was also carried out in order to justify the reaction mechanism.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791800900202","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47112554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.1177/204124791800900103
Sharifah Hashim, S. Zakaria, C. Chia, Sharifah Nabihah Syed Jaafar
In this study, soda alkali lignin from oil palm empty fruit bunch (EFB-AL) and kenaf core (KC-AL) are esterified with maleic anhydride under two different conditions, namely i) pyridine at temperature of 120°C for 3h and ii) aqueous alkaline solution at room temperature for 4h. As a result, the weight percentage gain (WPG) of the esterified EFB-AL (EFB-EL) and esterified KC-AL (KC-EL) in pyridine demonstrated a higher compared to aqueous alkaline solution. The FT-IR results of EFB-EL and KC-EL in both solvents exhibited some changes at the carbonyl and hydroxyl groups. Furthermore, the esterification process induced the carboxylic peak to appear in both alkali lignin samples. The outcome is confirmed by conducting H-NMR analysis, which demonstrated ester and carboxylic acid peaks within the spectral analysis. Finally, the TGA results showed both EFB-EL and KC-EL that are exposed to aqueous alkaline actually possessed better thermal stability and higher activation energy (Ea) compared to the esterified samples in pyridine.
{"title":"Enhanced Thermal Stability of Esterified Lignin in Different Solvent Mediums","authors":"Sharifah Hashim, S. Zakaria, C. Chia, Sharifah Nabihah Syed Jaafar","doi":"10.1177/204124791800900103","DOIUrl":"https://doi.org/10.1177/204124791800900103","url":null,"abstract":"In this study, soda alkali lignin from oil palm empty fruit bunch (EFB-AL) and kenaf core (KC-AL) are esterified with maleic anhydride under two different conditions, namely i) pyridine at temperature of 120°C for 3h and ii) aqueous alkaline solution at room temperature for 4h. As a result, the weight percentage gain (WPG) of the esterified EFB-AL (EFB-EL) and esterified KC-AL (KC-EL) in pyridine demonstrated a higher compared to aqueous alkaline solution. The FT-IR results of EFB-EL and KC-EL in both solvents exhibited some changes at the carbonyl and hydroxyl groups. Furthermore, the esterification process induced the carboxylic peak to appear in both alkali lignin samples. The outcome is confirmed by conducting H-NMR analysis, which demonstrated ester and carboxylic acid peaks within the spectral analysis. Finally, the TGA results showed both EFB-EL and KC-EL that are exposed to aqueous alkaline actually possessed better thermal stability and higher activation energy (Ea) compared to the esterified samples in pyridine.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791800900103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66126653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1177/204124791700800403
S. Mousavi, S. Hashemi, A. Amani, H. Saed, Sara Jahandideh, Fatemeh Mojoudi
In this study, the effect of renewable and degradable resources including Oak shell, potassium sorbate and egg shell nanoparticles on the overall properties of polyethylene terephthalate (PET)/acryl butadiene styrene (ABS) were investigated. In this regard, the effect of mentioned additives on the mechanical properties, oxygen permeability, water absorption rate and anti-microbial properties of recycled PET/ABS blend were examined. The results revealed that the addition of ABS to PET can lead to an increase in tensile strength, while it can lead to a decrease in the elongation at break and Young's modulus. Moreover, the addition of Oak shell and potassium sorbate to the PET/ABS mixture can enhance the antimicrobial properties. However, these additives can lead to a significant increase in the water absorption and oxygen permeability within the PET/ABS mixture. On the other hand, reinforcement of PET/ABS with egg shell nanoparticles not only improves the mechanical properties of PET/ABS but also can lead to a decrease in the water absorption and oxygen permeability compared with neat PET/ABS. The main aim of this study is to develop anti-bacterial and degradable plastic structures based on recycled PET/ABS to find a solution for recycling plastic based scraps or improving their natural degradability.
{"title":"Polyethylene Terephthalate/Acryl Butadiene Styrene Copolymer Incorporated with Oak Shell, Potassium Sorbate and Egg Shell Nanoparticles for Food Packaging Applications: Control of Bacteria Growth, Physical and Mechanical Properties","authors":"S. Mousavi, S. Hashemi, A. Amani, H. Saed, Sara Jahandideh, Fatemeh Mojoudi","doi":"10.1177/204124791700800403","DOIUrl":"https://doi.org/10.1177/204124791700800403","url":null,"abstract":"In this study, the effect of renewable and degradable resources including Oak shell, potassium sorbate and egg shell nanoparticles on the overall properties of polyethylene terephthalate (PET)/acryl butadiene styrene (ABS) were investigated. In this regard, the effect of mentioned additives on the mechanical properties, oxygen permeability, water absorption rate and anti-microbial properties of recycled PET/ABS blend were examined. The results revealed that the addition of ABS to PET can lead to an increase in tensile strength, while it can lead to a decrease in the elongation at break and Young's modulus. Moreover, the addition of Oak shell and potassium sorbate to the PET/ABS mixture can enhance the antimicrobial properties. However, these additives can lead to a significant increase in the water absorption and oxygen permeability within the PET/ABS mixture. On the other hand, reinforcement of PET/ABS with egg shell nanoparticles not only improves the mechanical properties of PET/ABS but also can lead to a decrease in the water absorption and oxygen permeability compared with neat PET/ABS. The main aim of this study is to develop anti-bacterial and degradable plastic structures based on recycled PET/ABS to find a solution for recycling plastic based scraps or improving their natural degradability.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791700800403","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46460313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1177/204124791700800402
C. Luchese, Luís Fernando Wentz Brum, A. Piovesana, K. Caetano, S. H. Flôres
The bioactive compounds incorporation for the production of biodegradable food packagings comes as a viable and environmentally friendly substitute in order to improve the nutritional value as well as extend the shelf life of highly perishable food products. Moreover, the use of bioactive compounds has been directly associated with the promotion of health aspects; the ingestion of bioactive compounds is related with minimizing risks of some diseases such as hypertension, diabetes, and coronary heart diseases. Therefore, the present study carried out a review of the current scenario in the film's production with natural antioxidants addition. The prebiotics and probiotics compound addition in films properties produced were also discussed in this work. Additionally, the film biodegradation properties should also be taken into account for their right disposal in the environment. Some factors that can to affect the biodegradation process are the nature of the polymer, the interactions among the blend components, its crystallinity, and the environmental conditions (light, temperature, O2 concentrations; and humidity). Therefore, the evaluation of relationships between structure and the polymers biodegradability is the extreme importance.
{"title":"Bioactive Compounds Incorporation into the Production of Functional Biodegradable Films - A Review","authors":"C. Luchese, Luís Fernando Wentz Brum, A. Piovesana, K. Caetano, S. H. Flôres","doi":"10.1177/204124791700800402","DOIUrl":"https://doi.org/10.1177/204124791700800402","url":null,"abstract":"The bioactive compounds incorporation for the production of biodegradable food packagings comes as a viable and environmentally friendly substitute in order to improve the nutritional value as well as extend the shelf life of highly perishable food products. Moreover, the use of bioactive compounds has been directly associated with the promotion of health aspects; the ingestion of bioactive compounds is related with minimizing risks of some diseases such as hypertension, diabetes, and coronary heart diseases. Therefore, the present study carried out a review of the current scenario in the film's production with natural antioxidants addition. The prebiotics and probiotics compound addition in films properties produced were also discussed in this work. Additionally, the film biodegradation properties should also be taken into account for their right disposal in the environment. Some factors that can to affect the biodegradation process are the nature of the polymer, the interactions among the blend components, its crystallinity, and the environmental conditions (light, temperature, O2 concentrations; and humidity). Therefore, the evaluation of relationships between structure and the polymers biodegradability is the extreme importance.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791700800402","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46971858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-01DOI: 10.1177/204124791700800401
S. Rodriguez, F. Torres, D. López
Nostoc Commune bacteria release a variety of polysaccharides into the culture medium during cell growth. In this paper we report, for the first time, the use of these polysaccharides as a raw material for the preparation of biopolymeric films. The structural characterization of the films prepared was assessed by FTIR and 1H-NMR. XRD and thermal analysis tests showed that these films are amorphous and have a glass transition temperature of −25°C. Tensile tests showed that NCP films displayed a similar mechanical behavior in comparison with other natural biopolymer films. These results suggest that these NCP films can be used for the development of new biopolymeric materials with potential applications in the food and biomedical industries.
{"title":"Preparation and Characterization of Polysaccharide Films from the Cyanobacteria Nostoc commune","authors":"S. Rodriguez, F. Torres, D. López","doi":"10.1177/204124791700800401","DOIUrl":"https://doi.org/10.1177/204124791700800401","url":null,"abstract":"Nostoc Commune bacteria release a variety of polysaccharides into the culture medium during cell growth. In this paper we report, for the first time, the use of these polysaccharides as a raw material for the preparation of biopolymeric films. The structural characterization of the films prepared was assessed by FTIR and 1H-NMR. XRD and thermal analysis tests showed that these films are amorphous and have a glass transition temperature of −25°C. Tensile tests showed that NCP films displayed a similar mechanical behavior in comparison with other natural biopolymer films. These results suggest that these NCP films can be used for the development of new biopolymeric materials with potential applications in the food and biomedical industries.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791700800401","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41880976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.1177/204124791700800303
S. Mousavi, S. Hashemi, Sara Jahandideh, S. Baseri, M. Zarei, Sara Azadi
Nanocomposites containing phenol novolac epoxy resin (PNER) were modified by unsaturated polyester resin (UPR) and then reinforced using sasobit and silica nanoparticles at different filler loadings via a multi-step manufacturing procedure. Afterward, effect of sasobit and silica loadings either on mechanical and thermal properties or on morphology of nanocomposites were examined. Results showed that increase in silica nanoparticles loading can improve both thermal and mechanical properties, but increase in silica loading more than 3 wt% can lead to decrease in the mechanical properties. In this case, addition of sasobit along with silica not only can improve the mechanical and thermal properties but also it can lead to improve in dispersion quality and morphology of nanocomposites. Eventually, with affordable and environmentally friendly materials such as sasobit, either production procedure or the overall quality and properties of nanocomposites can be improved.
{"title":"Modification of Phenol Novolac Epoxy Resin and Unsaturated Polyester Using Sasobit and Silica Nanoparticles","authors":"S. Mousavi, S. Hashemi, Sara Jahandideh, S. Baseri, M. Zarei, Sara Azadi","doi":"10.1177/204124791700800303","DOIUrl":"https://doi.org/10.1177/204124791700800303","url":null,"abstract":"Nanocomposites containing phenol novolac epoxy resin (PNER) were modified by unsaturated polyester resin (UPR) and then reinforced using sasobit and silica nanoparticles at different filler loadings via a multi-step manufacturing procedure. Afterward, effect of sasobit and silica loadings either on mechanical and thermal properties or on morphology of nanocomposites were examined. Results showed that increase in silica nanoparticles loading can improve both thermal and mechanical properties, but increase in silica loading more than 3 wt% can lead to decrease in the mechanical properties. In this case, addition of sasobit along with silica not only can improve the mechanical and thermal properties but also it can lead to improve in dispersion quality and morphology of nanocomposites. Eventually, with affordable and environmentally friendly materials such as sasobit, either production procedure or the overall quality and properties of nanocomposites can be improved.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791700800303","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48069552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.1177/204124791700800302
J. Saeng-On, D. Aht-Ong
Due to an insufficiency of fossil fuels and environmental pollution, sustainable and efficient material utilization has become the greatest importance. This work aimed to produce nanosized filler for biobased materials from renewable resource by an efficient production. Banana and tapioca starch nanocrystals (SNCs) were prepared from mild acid hydrolysis method. The effects of acid type, acid concentration, reaction time, and temperature on percent yield and degree of crystallinity were investigated in order to find the suitable condition for SNCs preparation. The chemical structure, degree of crystallinity, and morphology of the obtained SNCs were examined by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and transmission electron microscopy (TEM), respectively. Thermal properties were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results revealed that the suitable conditions for preparing SNCs were by using 3.5 M H2SO4 at 40°C for 7 hrs or 10 hrs depending on starch type, which leading to high degree of crystallinity as 47.13% and 60.06% for banana and tapioca SNCs, respectively. The particle size of both SNCs was less than 200 nm, approximately 30–70 nm. The banana SNC displayed parallelepiped nanoplatelets with C-type crystallinity, while the tapioca SNC showed spherical nanoplatelets with A-type crystallinity. The degradation temperature of banana and tapioca SNCs occurred in ranging between 280 and 310°C, which was lower than their native starches due to the disintegration of the SNC molecular chain during acid hydrolysis reaction. Nevertheless, melting enthalpy (ΔH) of SNC fillers enhanced after hydrolysis indicating that there was an increment of degree of crystallinity owing to the chain rearrangement of starch molecules.
{"title":"Production of Starch Nanocrystals from Agricultural Materials Using Mild Acid Hydrolysis Method: Optimization and Characterization","authors":"J. Saeng-On, D. Aht-Ong","doi":"10.1177/204124791700800302","DOIUrl":"https://doi.org/10.1177/204124791700800302","url":null,"abstract":"Due to an insufficiency of fossil fuels and environmental pollution, sustainable and efficient material utilization has become the greatest importance. This work aimed to produce nanosized filler for biobased materials from renewable resource by an efficient production. Banana and tapioca starch nanocrystals (SNCs) were prepared from mild acid hydrolysis method. The effects of acid type, acid concentration, reaction time, and temperature on percent yield and degree of crystallinity were investigated in order to find the suitable condition for SNCs preparation. The chemical structure, degree of crystallinity, and morphology of the obtained SNCs were examined by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and transmission electron microscopy (TEM), respectively. Thermal properties were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results revealed that the suitable conditions for preparing SNCs were by using 3.5 M H2SO4 at 40°C for 7 hrs or 10 hrs depending on starch type, which leading to high degree of crystallinity as 47.13% and 60.06% for banana and tapioca SNCs, respectively. The particle size of both SNCs was less than 200 nm, approximately 30–70 nm. The banana SNC displayed parallelepiped nanoplatelets with C-type crystallinity, while the tapioca SNC showed spherical nanoplatelets with A-type crystallinity. The degradation temperature of banana and tapioca SNCs occurred in ranging between 280 and 310°C, which was lower than their native starches due to the disintegration of the SNC molecular chain during acid hydrolysis reaction. Nevertheless, melting enthalpy (ΔH) of SNC fillers enhanced after hydrolysis indicating that there was an increment of degree of crystallinity owing to the chain rearrangement of starch molecules.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791700800302","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48870831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-01DOI: 10.1177/204124791700800301
O. Troncoso, B. Zamora, F. Torres
In recent years, natural gums and mucilages have been shown to be useful in the food and pharmacological industries. In this study, the mucilage of the fruit of Cordia lueta has been extracted and characterised in order to explore its potential applications. Thermogravimetric tests were used to measure the water content of this natural mucilage. Differential scanning calorimetry allowed assessing thermal transitions and thermal degradation of the samples. Steady flow rheometry was used to measure the viscosity of the samples as a function of the shear rate. Dynamic oscillatory rheometry was used to study the variation of the storage and loss modulus of the mucilage as function of the oscillatory frequency and stress. The results showed that this mucilage is a polysaccharide network that behaves as a pseudoplastic fluid. Its storage modulus is not completely independent from the oscillation frequency. In addition, the stress sweeps showed that C. lutea mucilage has a reversible stress softening behaviour. The findings reported in the present work suggest that this mucilage can be used as a rheology modifier for commercial foods and biomedical materials.
{"title":"Thermal and Rheological Properties of the Mucilage from the Fruit of Cordia lutea","authors":"O. Troncoso, B. Zamora, F. Torres","doi":"10.1177/204124791700800301","DOIUrl":"https://doi.org/10.1177/204124791700800301","url":null,"abstract":"In recent years, natural gums and mucilages have been shown to be useful in the food and pharmacological industries. In this study, the mucilage of the fruit of Cordia lueta has been extracted and characterised in order to explore its potential applications. Thermogravimetric tests were used to measure the water content of this natural mucilage. Differential scanning calorimetry allowed assessing thermal transitions and thermal degradation of the samples. Steady flow rheometry was used to measure the viscosity of the samples as a function of the shear rate. Dynamic oscillatory rheometry was used to study the variation of the storage and loss modulus of the mucilage as function of the oscillatory frequency and stress. The results showed that this mucilage is a polysaccharide network that behaves as a pseudoplastic fluid. Its storage modulus is not completely independent from the oscillation frequency. In addition, the stress sweeps showed that C. lutea mucilage has a reversible stress softening behaviour. The findings reported in the present work suggest that this mucilage can be used as a rheology modifier for commercial foods and biomedical materials.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791700800301","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41642000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1177/204124791700800202
A.A. Ummu Habeeba, C. Reshmi, A. Sujith
This paper reports the fabrication of natural, biodegradable, disposable and low cost clothing with antibacterial activity. Chitosan has been successfully immobilized on woven cotton with the help of natural rubber latex. The water contact angle studies reveal increased hydrophilicity of the samples with increase in chitosan concentration. The as prepared materials exhibited excellent antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). Due to the electrostatic interaction between chitosan and bacterial surface, the chitosan immobilized samples exhibited clear inhibition zones. This study invokes the possibility of fabrication of medical textiles with antibacterial properties by simple processing of woven cotton materials.
{"title":"Chitosan Immobilized Cotton Fibres for Antibacterial Textile Materials","authors":"A.A. Ummu Habeeba, C. Reshmi, A. Sujith","doi":"10.1177/204124791700800202","DOIUrl":"https://doi.org/10.1177/204124791700800202","url":null,"abstract":"This paper reports the fabrication of natural, biodegradable, disposable and low cost clothing with antibacterial activity. Chitosan has been successfully immobilized on woven cotton with the help of natural rubber latex. The water contact angle studies reveal increased hydrophilicity of the samples with increase in chitosan concentration. The as prepared materials exhibited excellent antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). Due to the electrostatic interaction between chitosan and bacterial surface, the chitosan immobilized samples exhibited clear inhibition zones. This study invokes the possibility of fabrication of medical textiles with antibacterial properties by simple processing of woven cotton materials.","PeriodicalId":20353,"journal":{"name":"Polymers from Renewable Resources","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/204124791700800202","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66126556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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