γ-辐照L型聚乳酸的结构与性能研究  

Effect ofγ-irradiation on the Structure and Properties of the Poly(L-lactic acid)

作　　者：何海霞[1] 牛明军[1] 陈金周[1] 马帅领[1] 李新法[1] 王经武[1] 

机构地区：[1]郑州大学包装设计研究中心,郑州450052

出　　处：《包装工程》2007年第8期25-27,33,共4页Packaging Engineering

摘　　要：考察了辐射剂量(D)在0～25kGy范围和空气气氛下,γ-辐照对L型聚乳酸(PLLA)的粘均分子量((?)_η)、力学性能、热稳定性和化学结构的影响。结果表明:在0～15kGy的剂量范围内,所研究的PLLA的(?)_η随D增大而减小;而在15～25kGy的剂量范围内,其(?)_η则随D的增大而提高;PLLA的拉伸和弯曲性能受D的影响较小,而它的冲击强度随D的增大而呈现升高的趋势;PLLA的热分解温度因γ-辐照则有所下降,γ-辐照使PLLA的化学结构略有变化。The effect of γ-irradiation dose（ range from 0 to 25kGy ） on the viscosity-average molecular weight （^-Mη）, mechanical properties, thermal performance, and the chemical structure of poly（L-lactic acid ） （ PLLA ） under air atmosphere was investigated. The results shown that the ^-Mη reduced in the doses range from 0 to 15kGy, but the M, increased from 15 to 25kGy of the doses; under the lower doses（ range from 0 to 25kGy ）, the tensile and bending properties were little affected by v-irradiation, but the impact strength was enhanced with increasing doses; its thermal decomposition temperature was decreased after being γ-irradiated. The chemical structure of irradiated PLLA was changed in extent, according to the infra-red spectrum （ IR）.

关 键 词：L型聚乳酸 Γ-辐照 粘均分子量 力学性能 热性能 

分 类 号：TQ326.9[化学工程—合成树脂塑料工业]