A novel process for generation of a CaCO3–polymer nanocomposite with a controlled three-dimensional shape was developed. Specifically, a nanocomposite with a high CaCO3 content was produced by introducing supercritical CO2 into a polymer matrix containing Ca ions. A mixture of poly(vinyl alcohol), Ca acetate, and poly(acrylic acid) was poured into a mold, the mold was placed in an autoclave, and CO2 was introduced to precipitate CaCO3 within the polymer matrix. Laser Raman spectroscopy and transmission electron microscopy showed that this process produced a nanocomposite containing highly dispersed CaCO3 (aragonite) nanoparticles. The flexural strength of the nanocomposite was larger than the flexural strengths of limestone and CaCO3 produced by hydrothermal hot pressing. The use of supercritical CO2 facilitated CO2 dissolution, which resulted in rapid precipitation of CaCO3 in the polymer matrix. The above-described process has potential utility for fixation of CO2.
{"title":"CaCO3–Polymer Nanocomposite Prepared with Supercritical CO2","authors":"H. Wakayama","doi":"10.1155/2018/9783941","DOIUrl":"https://doi.org/10.1155/2018/9783941","url":null,"abstract":"A novel process for generation of a CaCO3–polymer nanocomposite with a controlled three-dimensional shape was developed. Specifically, a nanocomposite with a high CaCO3 content was produced by introducing supercritical CO2 into a polymer matrix containing Ca ions. A mixture of poly(vinyl alcohol), Ca acetate, and poly(acrylic acid) was poured into a mold, the mold was placed in an autoclave, and CO2 was introduced to precipitate CaCO3 within the polymer matrix. Laser Raman spectroscopy and transmission electron microscopy showed that this process produced a nanocomposite containing highly dispersed CaCO3 (aragonite) nanoparticles. The flexural strength of the nanocomposite was larger than the flexural strengths of limestone and CaCO3 produced by hydrothermal hot pressing. The use of supercritical CO2 facilitated CO2 dissolution, which resulted in rapid precipitation of CaCO3 in the polymer matrix. The above-described process has potential utility for fixation of CO2.","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130201430","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 : 1900-01-01DOI: 10.37247/papt.1.2019.1-23
T. Tseng, Tzuoo‐Tsair Luo, Hsiao-shan Chiu, Chih‐Chieh Wang, Gene-Hsiang Lee, H. Sheu, Kuang‐Lieh Lu
A discrete complex [Zn(tpro)2(H2O)2] (1, Htpro = L-thioproline), and two structural isomers of coordination polymers, a 1D chain of [Zn(tpro)2]n (2) and a layer structure of [Zn(tpro)2]n (3), have been synthesized and characterized. The discrete complex 1 undergoes a single-crystal to single-crystal temperature-driven structural transformation, leading to a 1D helical coordination polymer 2. Compound 3 has a 2D homochiral layer network with a (4,4) topology. These layers are mutually linked through hydrogen bonding interactions, resulting in the formation of a 3D network. When 1 was heated, it undergoes almost completely conversion to the microcrystalline of compound 2, which was confirmed by powder X-ray diffractions (PXRD). After removing the coordinated water molecules by heating at temperature of up to 150 C, the carboxylate motifs could be activated and their orientations became distorted, after which, they attacked the activation sites of the Zn(II) centers, leading to a the formation of a 1D helix. Moreover, a portion of the PXRD pattern of 3 was converted into a pattern for 2, and the ratio between 2 and 3 was precisely determined by the simulating study of the synchrotron in situ PXRD patterns. Consequently, such a 0D complex is capable of underdoing single-crystal to single-crystal transformations and can be converted into 1D and/or 2D amino acid-based coordination polymers. Prime Archives in Polymer Technology www.videleaf.com
合成了离散配合物[Zn(tpro)2(H2O)2] (1, Htpro = l -硫脯氨酸)和配位聚合物的两种结构异构体[Zn(tpro)2]n(2)的一维链和[Zn(tpro)2]n(3)的层状结构。离散配合物1经历单晶到单晶的温度驱动结构转变，形成一维螺旋配位聚合物2。化合物3具有具有(4,4)拓扑结构的二维同手性层网络。这些层通过氢键相互作用相互连接，形成一个三维网络。当1被加热时，它几乎完全转化为化合物2的微晶，通过粉末x射线衍射(PXRD)证实了这一点。在高达150℃的温度下加热去除配位水分子后，羧酸基序被激活，其取向发生扭曲，攻击Zn(II)中心的活化位点，形成一维螺旋结构。此外，通过对同步加速器原位PXRD谱图的模拟研究，将部分3的PXRD谱图转化为2的PXRD谱图，并精确确定了2与3的比值。因此，这种0D配合物能够进行单晶到单晶的转化，并且可以转化为一维和/或二维氨基酸基配位聚合物。高分子技术主要档案www.videleaf.com
{"title":"Single-Crystal to Single-Crystal Structural Transformations of Amino-Acid-Based Coordination Polymers: Syntheses and Structural Characterization","authors":"T. Tseng, Tzuoo‐Tsair Luo, Hsiao-shan Chiu, Chih‐Chieh Wang, Gene-Hsiang Lee, H. Sheu, Kuang‐Lieh Lu","doi":"10.37247/papt.1.2019.1-23","DOIUrl":"https://doi.org/10.37247/papt.1.2019.1-23","url":null,"abstract":"A discrete complex [Zn(tpro)2(H2O)2] (1, Htpro = L-thioproline), and two structural isomers of coordination polymers, a 1D chain of [Zn(tpro)2]n (2) and a layer structure of [Zn(tpro)2]n (3), have been synthesized and characterized. The discrete complex 1 undergoes a single-crystal to single-crystal temperature-driven structural transformation, leading to a 1D helical coordination polymer 2. Compound 3 has a 2D homochiral layer network with a (4,4) topology. These layers are mutually linked through hydrogen bonding interactions, resulting in the formation of a 3D network. When 1 was heated, it undergoes almost completely conversion to the microcrystalline of compound 2, which was confirmed by powder X-ray diffractions (PXRD). After removing the coordinated water molecules by heating at temperature of up to 150 C, the carboxylate motifs could be activated and their orientations became distorted, after which, they attacked the activation sites of the Zn(II) centers, leading to a the formation of a 1D helix. Moreover, a portion of the PXRD pattern of 3 was converted into a pattern for 2, and the ratio between 2 and 3 was precisely determined by the simulating study of the synchrotron in situ PXRD patterns. Consequently, such a 0D complex is capable of underdoing single-crystal to single-crystal transformations and can be converted into 1D and/or 2D amino acid-based coordination polymers. Prime Archives in Polymer Technology www.videleaf.com","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120953925","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}
The structure of perhydropolysilazane (PHPS)-derived silica (PDS) thin layers which were synthesized on the surface of the Si-, Al 2 O 3 -, MgO-, and polyvinyl alcohol PVA-substrate have been studied by neutron reflectivity (NR) analyses. The results suggested that uniform PDS thin layers were synthesized on the surface of the substrates and the density of the layers varied depending on the type of substrate. Since the change in PDS density is correlated with the p K a value of the OH group on the substrate, it can be suggested that the acidity of the substrate would be one of the main factors determining the density of the coated PDS thin layers. On the other hand, the fine nanostructure of the PDS thin layer in the deep-buried condition have been poorly understood because a large background scattering originating from the sample matrix is a major obstacle for fine-structure analysis of a nanometric layer buried in a bulk material. As polarization analysis can decrease undesired scattering in a NR profile, we performed NR experiments with polarization analysis on a polypropylene (PP)/PDS/Si substrate sample, having a deep-buried layer of SiO 2 for increasing the amplitude of the Kiessig fringes in the higher scattering vector ( Q z ) region of the NR profiles in the sample by decreasing the undesired background scattering. Fitting and Fourier transform analysis results of the NR data indicated that the synthesized PDS layer remained between the PP plate and Si substrate with a thickness of approximately 109 Å. Furthermore, the scattering length density of the PDS layer, obtained from the background subtracted data appeared to be more accurate than that obtained from the raw data. Although the density of the PDS layer was lower than that of natural SiO 2 , the PDS thin layer had adequate mechanical strength to maintain a uniform PDS layer in the depth-direction under the deep-buried condition.
{"title":"Nano-Structure Studies of Perhydropolysilazane - Derived Silica Thin Layers","authors":"T. Niizeki, Y. Hasegawa, K. Akutsu-Suyama","doi":"10.37247/PAPT.1.2021.23","DOIUrl":"https://doi.org/10.37247/PAPT.1.2021.23","url":null,"abstract":"The structure of perhydropolysilazane (PHPS)-derived silica (PDS) thin layers which were synthesized on the surface of the Si-, Al 2 O 3 -, MgO-, and polyvinyl alcohol PVA-substrate have been studied by neutron reflectivity (NR) analyses. The results suggested that uniform PDS thin layers were synthesized on the surface of the substrates and the density of the layers varied depending on the type of substrate. Since the change in PDS density is correlated with the p K a value of the OH group on the substrate, it can be suggested that the acidity of the substrate would be one of the main factors determining the density of the coated PDS thin layers. On the other hand, the fine nanostructure of the PDS thin layer in the deep-buried condition have been poorly understood because a large background scattering originating from the sample matrix is a major obstacle for fine-structure analysis of a nanometric layer buried in a bulk material. As polarization analysis can decrease undesired scattering in a NR profile, we performed NR experiments with polarization analysis on a polypropylene (PP)/PDS/Si substrate sample, having a deep-buried layer of SiO 2 for increasing the amplitude of the Kiessig fringes in the higher scattering vector ( Q z ) region of the NR profiles in the sample by decreasing the undesired background scattering. Fitting and Fourier transform analysis results of the NR data indicated that the synthesized PDS layer remained between the PP plate and Si substrate with a thickness of approximately 109 Å. Furthermore, the scattering length density of the PDS layer, obtained from the background subtracted data appeared to be more accurate than that obtained from the raw data. Although the density of the PDS layer was lower than that of natural SiO 2 , the PDS thin layer had adequate mechanical strength to maintain a uniform PDS layer in the depth-direction under the deep-buried condition.","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130060182","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 : 1900-01-01DOI: 10.37247/papt.1.2019.01-014
Jin Xu, Yan He
{"title":"Thermal Analysis of MWCNTs / NR Polymer Composite Aligned in a Magnetic Field","authors":"Jin Xu, Yan He","doi":"10.37247/papt.1.2019.01-014","DOIUrl":"https://doi.org/10.37247/papt.1.2019.01-014","url":null,"abstract":"","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122611095","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 : 1900-01-01DOI: 10.37247/papt.1.2019.1-6
A. Moral, R. Aguado, Andrea Pipió, A. Tijero, Menta Ballesteros
This Book Chapter is a republication of an article published by Ana Moral, et al. at International Journal of Polymer Science in May 2015. (Ana Moral, Roberto Aguado, Menta Ballesteros, and Antonio Tijero, “Cationization of Alpha-Cellulose to Develop New Sustainable Products,” International Journal of Polymer Science, vol. 2015, Article ID 283963, 9 pages, 2015. https://doi.org/10.1155/2015/283963.) In the chapter, authors want to simplify article conclusions to make a didactic explanation. The objective is to facilitate the knowing of the fundamental relationships between cellulose modifications and the most influential variables.
本书章节是Ana Moral等人于2015年5月在International Journal of Polymer Science上发表的一篇文章的再版。(Ana Moral, Roberto Aguado, Menta Ballesteros, Antonio Tijero，“阳离子化α -纤维素开发新的可持续产品”，国际高分子科学杂志，2015,Article ID 283963, 9页，2015。)https://doi.org/10.1155/2015/283963)。在本章中，作者想要简化文章的结论，做一个说教式的解释。目的是促进了解纤维素改性和最具影响力的变量之间的基本关系。
{"title":"Polyelectrolytes from Modified Natural Polysaccharides","authors":"A. Moral, R. Aguado, Andrea Pipió, A. Tijero, Menta Ballesteros","doi":"10.37247/papt.1.2019.1-6","DOIUrl":"https://doi.org/10.37247/papt.1.2019.1-6","url":null,"abstract":"This Book Chapter is a republication of an article published by Ana Moral, et al. at International Journal of Polymer Science in May 2015. (Ana Moral, Roberto Aguado, Menta Ballesteros, and Antonio Tijero, “Cationization of Alpha-Cellulose to Develop New Sustainable Products,” International Journal of Polymer Science, vol. 2015, Article ID 283963, 9 pages, 2015. https://doi.org/10.1155/2015/283963.) In the chapter, authors want to simplify article conclusions to make a didactic explanation. The objective is to facilitate the knowing of the fundamental relationships between cellulose modifications and the most influential variables.","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134065144","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}
G. Carissimi, A. A. Lozano-Pérez, G. Mercedes, Montalbán, S. Aznar-Cervantes, J. L. Cénis, G. Víllora
Several studies have stated that the process used for sericin removal, or degumming, from silk cocoons has a strong impact on the silk fibroin integrity and consequently in their mechanical or biochemical properties after processing it into several biomaterials (e.g., fibers, films or scaffolds) but still, there is a lack of information of the impact on the features of silk nanoparticles. In this work, silk cocoons were degummed following four standard methods: autoclaving, short alkaline (Na 2 CO 3 ) boiling, long alkaline (Na 2 CO 3 ) boiling, and ultrasounds. The resultant silk fibroin fibers were dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate and used for nanoparticle synthesis by rapid desolvation in polar organic solvents. The relative efficiencies of the degumming processes and the integrity of the resulting fibroin fibers obtained were analyzed by mass loss, optical microscopy, thermogravimetric analysis, infrared spectroscopy, and SDS-PAGE. Particle sizes and morphology were analyzed by Dynamic Light Scattering and Field Emission Scanning Electronic Microscopy. The results showed that the different treatments had a remarkable impact on the integrity of the silk fibroin chains, as confirmed by gel electrophoresis, which can be correlated with particle mean size and size distribution changes. The smallest nanoparticles (156 ± 3 nm) and the most negative Z potential (−30.2 ± 1.8 mV) were obtained with the combination of long treatment (2 h) of boiling in alkaline solution (Na 2 CO 3 0.02 eq/L). The study confirms that parameters of the process, such as the composition of the solution and time of the degumming step, must be controlled in order to reach an optimum reproducibility of the nanoparticle production.
一些研究表明，从蚕茧中去除丝胶蛋白或脱胶的过程对丝素蛋白的完整性产生了强烈的影响，因此在将其加工成几种生物材料(例如纤维、薄膜或支架)后，其机械或生化特性也受到了强烈的影响，但仍然缺乏对丝素纳米颗粒特征的影响的信息。本研究采用高压灭菌、短碱(na2co3)煮、长碱(na2co3)煮和超声波四种标准方法对蚕茧进行脱胶。将合成的丝素纤维溶解在离子液体1-乙基-3-甲基咪唑乙酸酯中，并在极性有机溶剂中快速脱溶用于纳米颗粒合成。通过质量损失、光学显微镜、热重分析、红外光谱和SDS-PAGE分析了脱胶过程的相对效率和所得丝蛋白纤维的完整性。采用动态光散射和场发射扫描电镜对颗粒大小和形貌进行了分析。结果表明，凝胶电泳证实，不同处理对丝素链完整性有显著影响，其影响与颗粒平均大小和粒径分布变化有关。在碱性溶液(Na 2 CO 3 0.02 eq/L)中长时间煮沸处理(2 h)得到的纳米颗粒最小(156±3 nm)，负Z电位最大(- 30.2±1.8 mV)。该研究证实，必须控制该工艺的参数，如溶液的组成和脱胶步骤的时间，以达到纳米颗粒生产的最佳再现性。
{"title":"Effect of Degumming in the Characteristics of Silk Fibroin Nanoparticles","authors":"G. Carissimi, A. A. Lozano-Pérez, G. Mercedes, Montalbán, S. Aznar-Cervantes, J. L. Cénis, G. Víllora","doi":"10.37247/papt.1.2020.9","DOIUrl":"https://doi.org/10.37247/papt.1.2020.9","url":null,"abstract":"Several studies have stated that the process used for sericin removal, or degumming, from silk cocoons has a strong impact on the silk fibroin integrity and consequently in their mechanical or biochemical properties after processing it into several biomaterials (e.g., fibers, films or scaffolds) but still, there is a lack of information of the impact on the features of silk nanoparticles. In this work, silk cocoons were degummed following four standard methods: autoclaving, short alkaline (Na 2 CO 3 ) boiling, long alkaline (Na 2 CO 3 ) boiling, and ultrasounds. The resultant silk fibroin fibers were dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate and used for nanoparticle synthesis by rapid desolvation in polar organic solvents. The relative efficiencies of the degumming processes and the integrity of the resulting fibroin fibers obtained were analyzed by mass loss, optical microscopy, thermogravimetric analysis, infrared spectroscopy, and SDS-PAGE. Particle sizes and morphology were analyzed by Dynamic Light Scattering and Field Emission Scanning Electronic Microscopy. The results showed that the different treatments had a remarkable impact on the integrity of the silk fibroin chains, as confirmed by gel electrophoresis, which can be correlated with particle mean size and size distribution changes. The smallest nanoparticles (156 ± 3 nm) and the most negative Z potential (−30.2 ± 1.8 mV) were obtained with the combination of long treatment (2 h) of boiling in alkaline solution (Na 2 CO 3 0.02 eq/L). The study confirms that parameters of the process, such as the composition of the solution and time of the degumming step, must be controlled in order to reach an optimum reproducibility of the nanoparticle production.","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124841027","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：