{"title":"一系列生物可降解聚合物的物理老化行为与垂链长度的关系","authors":"S. Bron, J. Fiordeliso, J. Kohn","doi":"10.1109/NEBC.1993.404381","DOIUrl":null,"url":null,"abstract":"The physical aging behavior of a series of tyrosine-containing polyarylates was investigated as a function of the length of the alkyl pendent chain. The experiments were performed in a differential scanning calorimeter (DSC) at corresponding aging temperatures. It was found that the physical aging efficiency was strongly affected by small changes in the length of the pendent chain (2, 6, or 8 methylene units). For similar cooling rates from above T/sub g/ to below T/sub g/ and identical aging times, the enthalpy relaxation decreased with the length of the pendent chain. A free volume based explanation is suggested.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"62 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Physical aging behavior of a series of biodegradable polymers as a function of the pendent-chain length\",\"authors\":\"S. Bron, J. Fiordeliso, J. Kohn\",\"doi\":\"10.1109/NEBC.1993.404381\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The physical aging behavior of a series of tyrosine-containing polyarylates was investigated as a function of the length of the alkyl pendent chain. The experiments were performed in a differential scanning calorimeter (DSC) at corresponding aging temperatures. It was found that the physical aging efficiency was strongly affected by small changes in the length of the pendent chain (2, 6, or 8 methylene units). For similar cooling rates from above T/sub g/ to below T/sub g/ and identical aging times, the enthalpy relaxation decreased with the length of the pendent chain. A free volume based explanation is suggested.<<ETX>>\",\"PeriodicalId\":159783,\"journal\":{\"name\":\"1993 IEEE Annual Northeast Bioengineering Conference\",\"volume\":\"62 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1993-03-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"1993 IEEE Annual Northeast Bioengineering Conference\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/NEBC.1993.404381\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"1993 IEEE Annual Northeast Bioengineering Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NEBC.1993.404381","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Physical aging behavior of a series of biodegradable polymers as a function of the pendent-chain length
The physical aging behavior of a series of tyrosine-containing polyarylates was investigated as a function of the length of the alkyl pendent chain. The experiments were performed in a differential scanning calorimeter (DSC) at corresponding aging temperatures. It was found that the physical aging efficiency was strongly affected by small changes in the length of the pendent chain (2, 6, or 8 methylene units). For similar cooling rates from above T/sub g/ to below T/sub g/ and identical aging times, the enthalpy relaxation decreased with the length of the pendent chain. A free volume based explanation is suggested.<>
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