Isocyanate toughened pCBT: Reactive blending and tensile properties
作者: T. AbtM. Sanchez-SotoA. Martinez de IlarduyaJ. J. Bou
刊名: eXPRESS Polymer Letters, 2013, Vol.7 (2), pp.172-185
来源数据库: Directory of Open Access Journals
DOI: 10.3144/expresspolymlett.2013.16
关键词: Mechanical propertiesCyclic butylene terephthalatePCBTIsocyanateToughening
原始语种摘要: Cyclic butylene terephthalate oligomers (CBT) were reacted in a ring-opening polymerization with three types of isocyanates: a bifunctional aromatic type, a bifunctional aliphatic type and a polymeric aromatic isocyanate. All reactions took place in a batch mixer. The use of 0.5 to 1 wt% isocyanate led to a dramatic increase in elongation at break of polymerized cyclic butylene terephthalate (pCBT), from 8 to above 100%. The stiffness and strength of the modified pCBT, however, were found to slightly decrease. Proton nuclear magnetic resonance (NMR) analysis shows that the formation of thermally stable amide groups is the dominant chain extension reaction mechanism. Gel content measurements suggest a linear structure for samples containing bifunctional isocyanates while pCBT modified with...
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  • butylene 丁烯
  • isocyanate 异氰酸盐
  • terephthalate 对酞酸盐
  • oligomer 低聚物
  • polymerized 聚合的
  • polymeric 聚合的
  • bifunctional 双功能的
  • polyfunctional 多官能团的
  • aliphatic 无环的
  • amide 酰胺