{"title":"过冷聚合物玻璃的玻璃化转变温度与玻璃形成能力的关系","authors":"R. Mishra, S. P. Pandey, Jitendra Gaur","doi":"10.5923/J.IJOE.20120205.01","DOIUrl":null,"url":null,"abstract":"The thermodynamic behaviour of glass forming undercooled melt have been studied by analysing the temperature dependence of the Gibbs free energy difference (G) for six poly meric glass forming materials (O-terphenyl, Tri-α-naphthyl benzene, Glycerol, Ethanol, 2-methylpentane and Phenyl salicylate (salol)) between the undercooled melt and the corresponding equilibriu m solid phases. The expression obtained by expanding free energies of the undercooled liquid and solid phases of the materials in the form of Taylor's series expansion. The procedure for the estimat ion of the ideal glass transition temperature has been reviewed together its importance in the glass forming ability of materials. The glass forming ability of undercooled materials is also explained in terms of ratio o f reduced glass transition temperature and ideal glass transition temperature. It has also reported that Glycerol has the largest melt ing interval with the poorest glass forming ab ility among these six poly mers. It has also been found that the best polymeric glass forming materials are at near eutectic composition. There is a strong correlation between glass forming ability of these polymeric materials. The thermodynamic behaviour of glass forming poly meric melts has been studied employ ing the expressions based on Taylor's series expansion and it is found that the expression for G, obtained are capable to explain temperature dependence of the thermodynamic quantities (G, H and S ) o f g lass forming poly meric melts quite satisfactorily. It is quite interesting to see the response of expression obtained on the basis of Taylor's series expansion in exp laining the temperature dependence of the thermodynamic quantity G for glass forming organic liquids. The present study is for the Gibbs free energy difference (G) between liquid and solid phases for glass forming organic melts by calculating G for six d ifferent samp les of organic glasses; o-terphenyl (o-ter), tri--napthyle benzene (tri--NB), phenyl salicylate (salo l), glycero l, ethanol and 2-methylpentane (2-mp) in the temperature range Tm to Tg in the frame of expression based on Taylor's series expansion. The expression for the entropy difference S based on Taylor's series expansion has been further emp loyed to find","PeriodicalId":14375,"journal":{"name":"International Journal of Online Engineering","volume":"26 1","pages":"26-29"},"PeriodicalIF":0.0000,"publicationDate":"2013-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"The Correlation between Reduced Glass Transition Temperature and Glass Forming Ability of Undercooled Polymeric Glasses\",\"authors\":\"R. Mishra, S. P. Pandey, Jitendra Gaur\",\"doi\":\"10.5923/J.IJOE.20120205.01\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The thermodynamic behaviour of glass forming undercooled melt have been studied by analysing the temperature dependence of the Gibbs free energy difference (G) for six poly meric glass forming materials (O-terphenyl, Tri-α-naphthyl benzene, Glycerol, Ethanol, 2-methylpentane and Phenyl salicylate (salol)) between the undercooled melt and the corresponding equilibriu m solid phases. The expression obtained by expanding free energies of the undercooled liquid and solid phases of the materials in the form of Taylor's series expansion. The procedure for the estimat ion of the ideal glass transition temperature has been reviewed together its importance in the glass forming ability of materials. The glass forming ability of undercooled materials is also explained in terms of ratio o f reduced glass transition temperature and ideal glass transition temperature. It has also reported that Glycerol has the largest melt ing interval with the poorest glass forming ab ility among these six poly mers. It has also been found that the best polymeric glass forming materials are at near eutectic composition. There is a strong correlation between glass forming ability of these polymeric materials. The thermodynamic behaviour of glass forming poly meric melts has been studied employ ing the expressions based on Taylor's series expansion and it is found that the expression for G, obtained are capable to explain temperature dependence of the thermodynamic quantities (G, H and S ) o f g lass forming poly meric melts quite satisfactorily. It is quite interesting to see the response of expression obtained on the basis of Taylor's series expansion in exp laining the temperature dependence of the thermodynamic quantity G for glass forming organic liquids. The present study is for the Gibbs free energy difference (G) between liquid and solid phases for glass forming organic melts by calculating G for six d ifferent samp les of organic glasses; o-terphenyl (o-ter), tri--napthyle benzene (tri--NB), phenyl salicylate (salo l), glycero l, ethanol and 2-methylpentane (2-mp) in the temperature range Tm to Tg in the frame of expression based on Taylor's series expansion. The expression for the entropy difference S based on Taylor's series expansion has been further emp loyed to find\",\"PeriodicalId\":14375,\"journal\":{\"name\":\"International Journal of Online Engineering\",\"volume\":\"26 1\",\"pages\":\"26-29\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2013-01-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Online Engineering\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.5923/J.IJOE.20120205.01\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Online Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5923/J.IJOE.20120205.01","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
The Correlation between Reduced Glass Transition Temperature and Glass Forming Ability of Undercooled Polymeric Glasses
The thermodynamic behaviour of glass forming undercooled melt have been studied by analysing the temperature dependence of the Gibbs free energy difference (G) for six poly meric glass forming materials (O-terphenyl, Tri-α-naphthyl benzene, Glycerol, Ethanol, 2-methylpentane and Phenyl salicylate (salol)) between the undercooled melt and the corresponding equilibriu m solid phases. The expression obtained by expanding free energies of the undercooled liquid and solid phases of the materials in the form of Taylor's series expansion. The procedure for the estimat ion of the ideal glass transition temperature has been reviewed together its importance in the glass forming ability of materials. The glass forming ability of undercooled materials is also explained in terms of ratio o f reduced glass transition temperature and ideal glass transition temperature. It has also reported that Glycerol has the largest melt ing interval with the poorest glass forming ab ility among these six poly mers. It has also been found that the best polymeric glass forming materials are at near eutectic composition. There is a strong correlation between glass forming ability of these polymeric materials. The thermodynamic behaviour of glass forming poly meric melts has been studied employ ing the expressions based on Taylor's series expansion and it is found that the expression for G, obtained are capable to explain temperature dependence of the thermodynamic quantities (G, H and S ) o f g lass forming poly meric melts quite satisfactorily. It is quite interesting to see the response of expression obtained on the basis of Taylor's series expansion in exp laining the temperature dependence of the thermodynamic quantity G for glass forming organic liquids. The present study is for the Gibbs free energy difference (G) between liquid and solid phases for glass forming organic melts by calculating G for six d ifferent samp les of organic glasses; o-terphenyl (o-ter), tri--napthyle benzene (tri--NB), phenyl salicylate (salo l), glycero l, ethanol and 2-methylpentane (2-mp) in the temperature range Tm to Tg in the frame of expression based on Taylor's series expansion. The expression for the entropy difference S based on Taylor's series expansion has been further emp loyed to find
期刊介绍:
We would like to inform you, that iJOE, the ''International Journal of Online Engineering'' will accept now also papers in the field of Biomedical Engineering and e-Health''. iJOE will therefore be published from January 2019 as the ''International Journal of Online and Biomedical Engineering''. The objective of the journal is to publish and discuss fundamentals, applications and experiences in the fields of Online Engineering (remote engineering, virtual instrumentation and online simulations, etc) and Biomedical Engineering/e-Health. The use of cyber-physical systems, virtual and remote controlled devices and remote laboratories are the directions for advanced teleworking/e-working environments. In general, online engineering is a future trend in engineering and science. Due to the growing complexity of engineering tasks, more and more specialized and expensive equipment as well as software tools and simulators, shortage of highly qualified staff, and the demands of globalization and collaboration activities, it become essential to utilize cyber cloud technologies to maximize the use of engineering resources. Online engineering is the way to address these issues. Considering these, one focus of the International Journal of Online and Biomedical Engineering is to provide a platform to publish fundamentals, applications and experiences in the field of Online Engineering, for example: Remote Engineering Internet of Things Cyber-physical Systems Digital Twins Industry 4.0 Virtual Instrumentation. An important application field of online engineering tools and principles are Biomedical Engineering / e-Health. Topics we are interested to publish are: Automation Technology for Medical Applications Big Data in Medicine Biomedical Devices Biosensors Biosignal Processing Clinical Informatics Computational Neuroscience Computer-Aided Surgery.