The single use packaging is widely used in various products; ranging from food to non-food contact, from commodity to specialty purposes. Most of these materials are derived from non-renewable fossil resources. In a sustainable manner, it needs to be recyclable or compostable. Good mechanical properties together with biodegradability can make the product more recyclable. In this study, the elasticity for films consisting of polybutylene adipate-co-terephthalate (PBAT) blended with polylactic acid (PLA) (10, and 20 %wt), additive and reactive agents were evaluated. The blends were prepared via a twin-screw extruder. The film specimens were prepared by cast film extrusion. The films were then stretched with different ratios (1.5, 2 and 2.5 times) by the uniaxial machine. The mechanical properties, elasticities and surface morphology of uniaxially stretched PBAT and PBAT blend films were characterized by tensile testing and scanning electron microscope (SEM), respectively. The tensile strength of stretched films tended to improve while the elongation at break reduced at higher stretching ratios. The surface morphology of stretched films revealed that the degree of orientation was increased after higher stretching ratios. The ability to recover in the plastic deformation region of stretched films was increased at the higher stretching ratios.
{"title":"Stretchability and Deformation Behavior of Polybutylene Adipate-co-terephthalate Blend Films","authors":"Korawit Kaoudom, S. Suttiruengwong, M. Seadan","doi":"10.53848/ssstj.v9i2.230","DOIUrl":"https://doi.org/10.53848/ssstj.v9i2.230","url":null,"abstract":"The single use packaging is widely used in various products; ranging from food to non-food contact, from commodity to specialty purposes. Most of these materials are derived from non-renewable fossil resources. In a sustainable manner, it needs to be recyclable or compostable. Good mechanical properties together with biodegradability can make the product more recyclable. In this study, the elasticity for films consisting of polybutylene adipate-co-terephthalate (PBAT) blended with polylactic acid (PLA) (10, and 20 %wt), additive and reactive agents were evaluated. The blends were prepared via a twin-screw extruder. The film specimens were prepared by cast film extrusion. The films were then stretched with different ratios (1.5, 2 and 2.5 times) by the uniaxial machine. The mechanical properties, elasticities and surface morphology of uniaxially stretched PBAT and PBAT blend films were characterized by tensile testing and scanning electron microscope (SEM), respectively. The tensile strength of stretched films tended to improve while the elongation at break reduced at higher stretching ratios. The surface morphology of stretched films revealed that the degree of orientation was increased after higher stretching ratios. The ability to recover in the plastic deformation region of stretched films was increased at the higher stretching ratios.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90949180","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}
Ananya Popradit, Atsushi Ishida, T. Murayama, T. Srisatit, T. Utarasakul, S. Kiratiprayoon, Roj Khun Anake, Somkid Outtaranakorn
Attitude of residing people towards a protected forest area was evaluated for sustainable use of natural resources and forest conservation in the Phu Kao–PhuPhan Kham National Park in Thailand. Their economic and social conditions were assessed in three villages of Phukao, NongBua Lamphu Province. Data were collected from 348 households (66.5%) heads or the representatives in the villages with the questionnaire. The questionnaire consisted of three parts: (i) general economic and social information (ii) social grouping and participation and (iii) attitude toward participation in conserving natural resources and tourism management in this area. To evaluate their attitude, the collected data were divided into four categories: (i) level 4 equilibrium/nature (ii) level 3 warning (iii) level 2 risk (iv) level 1 crisis for forest conservation in the protected area. Overall, their attitude towards natural resource conservation, the social grouping and the community participation was very low. However, the attitude towards ecotourism is very high. We suggest that forest conservation will be maintained by more progress of ecotourism in this area.
{"title":"Assessment of Human’s Attitude Towards Natural Resource Conservation in Protected Area in Thailand","authors":"Ananya Popradit, Atsushi Ishida, T. Murayama, T. Srisatit, T. Utarasakul, S. Kiratiprayoon, Roj Khun Anake, Somkid Outtaranakorn","doi":"10.14456/SSSTJ.2015.4","DOIUrl":"https://doi.org/10.14456/SSSTJ.2015.4","url":null,"abstract":"Attitude of residing people towards a protected forest area was evaluated for sustainable use of natural resources and forest conservation in the Phu Kao–PhuPhan Kham National Park in Thailand. Their economic and social conditions were assessed in three villages of Phukao, NongBua Lamphu Province. Data were collected from 348 households (66.5%) heads or the representatives in the villages with the questionnaire. The questionnaire consisted of three parts: (i) general economic and social information (ii) social grouping and participation and (iii) attitude toward participation in conserving natural resources and tourism management in this area. To evaluate their attitude, the collected data were divided into four categories: (i) level 4 equilibrium/nature (ii) level 3 warning (iii) level 2 risk (iv) level 1 crisis for forest conservation in the protected area. Overall, their attitude towards natural resource conservation, the social grouping and the community participation was very low. However, the attitude towards ecotourism is very high. We suggest that forest conservation will be maintained by more progress of ecotourism in this area.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"2 1","pages":"18-23"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66677374","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}
This survey research aimed to find the health effects of computer use on Suan Sunandha Rajabhat University’s personnel. A total of 312 samples were selected out of 1401 population by simple random method. Inferential statistics were used throughout the hypothesis testing and data analysis (percentage, mean and standard deviation). The correlation between risk factors and computer-used behavior were calculated by Pearson correlation and Creamer’s V coefficient (95% CI). The results indicated that the samples spend 6-10 hours of the workday on the computer. In order to create a good working environment, the organization has provided good computing facilities. The overview of computer-used behavior suggests that the personnel have regular good practice, i.e. 5-6 times per week. The research result found that the most of personnel have a regular eyestrain, eye fatigue, sore eyes and irritation symptoms at least 5-6 times per week. In addition, the personnel have regular neck, shoulder, back, waist and wrist pain symptoms at least 3-4 times per week. The result indicated that the computer user’s behavior and user’s health status relate to each other, and are in the same way. In conclusion, the academic staff requires the basic computer usage knowledge in order to avoid future health problems.
{"title":"The Health Effects of Computer Use on Personnel at the Suan Sunandha Rajabhat University","authors":"Rujijan Vichivanives, Wanwimon Mekwimon","doi":"10.14456/SSSTJ.2015.3","DOIUrl":"https://doi.org/10.14456/SSSTJ.2015.3","url":null,"abstract":"This survey research aimed to find the health effects of computer use on Suan Sunandha Rajabhat University’s personnel. A total of 312 samples were selected out of 1401 population by simple random method. Inferential statistics were used throughout the hypothesis testing and data analysis (percentage, mean and standard deviation). The correlation between risk factors and computer-used behavior were calculated by Pearson correlation and Creamer’s V coefficient (95% CI). The results indicated that the samples spend 6-10 hours of the workday on the computer. In order to create a good working environment, the organization has provided good computing facilities. The overview of computer-used behavior suggests that the personnel have regular good practice, i.e. 5-6 times per week. The research result found that the most of personnel have a regular eyestrain, eye fatigue, sore eyes and irritation symptoms at least 5-6 times per week. In addition, the personnel have regular neck, shoulder, back, waist and wrist pain symptoms at least 3-4 times per week. The result indicated that the computer user’s behavior and user’s health status relate to each other, and are in the same way. In conclusion, the academic staff requires the basic computer usage knowledge in order to avoid future health problems.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"02 1","pages":"13-17"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66677363","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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