聚己内酯/聚酯丙烯酸酯共混物的辐射交联及其形状记忆行为

RADIATION CROSSLINKING AND SHAPE MEMORY BEHAVIOR OF BLENDS OF POLY(εCAPROLACTONE) AND POLYFUNCTIONAL POLYESTER ACRYLATE

研究了聚酯丙烯酸酯 (PEA)类多官能团物质与聚己内酯 (PCL)共混物的辐射交联效应 .分别考察了多官能团PEA的用量、官能团数目、辐射交联剂量等因素对聚己内酯的辐射交联规律、动态力学性能、形状记忆行为等性能的影响 .结果表明 ,PCL PEA共混物的辐射交联规律不再遵从Charlesby Pinner关系式 ,而是符合陈欣方 刘克静 唐敖庆关系式 .多官能团PEA的加入可以显著提高PCL辐射交联的效率 ;相同剂量时 ,官能团数目越多、用量越大的样品 ,生成的凝胶含量越多 ,强化辐射交联效应越大 .DMA分析表明 ,PCL强化辐照交联后的弹性模量和耐热性能显著提高 .强化交联PCL在其熔点以上都呈现出高弹态平台 ,可以实现形状记忆 .且交联度较高 ,形状记忆恢复速率较快 .

The radiation crosslinking and shape memory behavior of the blends of poly( ε caprolactone)(PCL) and polyfunctional polyester acrylate (PEA) were studied.The influences of the usage of PEA,the number of functional group and radiation dose on radiation crosslinking,dynamic mechanical properties and shape memory behaviors of PCL were investigated.It was concluded that radiation crosslinking of PCL/PEA blends didn't follow the classic Charlesby Pinner equation,but was in agreement with Chen Liu Tang relation.The efficiency of radiation crosslinking of PCL could be distinctively improved by using polyfunctional PEA.The more the usage and the functional group number,the more the gel content and the more distinctive the radiation crosslinking effects.This also indicated that the polyfunctional PEA directly participated in the crosslinking reaction.The DMA analysis indicated that enhanced radiation cross linking raised the heat deformation temperature of PCL and presented a higher and wider rubbery state plateau,whereas rendered more enough strength at temperatures above the melting point of PCL and provided enough force to recover more strain than in the case of pure PCL.The shape memory results revealed that the well crosslinked PCL presented 100% strain recovery with quick recovery rate.