γ-辐照对PLLA分子量及结晶形态的影响  

The Effect of γ-Radiation on the Molecular Weight and Crystalline Morphology of PLLA

作　　者：刘晓玉[1] 田孟超[1] 陈金周[1] 王文鹏[1] 于伟东[1] 段锐侠[1] 牛明军[1] 李新法[1] 

机构地区：[1]郑州大学材料科学与工程学院,郑州450001

出　　处：《高分子通报》2010年第1期81-84,共4页Polymer Bulletin

摘　　要：以左旋聚乳酸（PLLA）为研究对象，以多官能团单体三烯丙基异氰酸酯（TAIC）为交联剂，采用反应挤出技术制备了PLLA-TAIC体系，并利用^60Co-γ射线源，在较低辐照剂量（Dose≤25kGy）范围内，对所制备的聚合物进行了γ-辐照。研究了γ-辐照剂量、交联剂含量对PLLA分子量和结晶形态的影响。结果表明，在0～25kGy辐照剂量范围内，PLLA-TAIC的粘均分子量（^-Mη）随γ-辐照剂量的增加呈现出先升高后降低的变化趋势，辐照剂量为10kGy、TAIC含量为3份时，PLLA的^-Mη提高的幅度最大；随着辐照剂量的增加，原料PLLA形成的球晶尺寸有所增大；对于γ-辐照的PLLA—TAIC体系，随着TAIC含量的增加，PLLA的结晶能力有所下降。With PLLA as the research object, polyfunctional monomer triallyl isocyanurate （TALC） was added as crosslinking agent to prepare PLLA-TAIC through reactive extrusion technology. These products were treated by different doses （D≤25kGy） of 6^60Co γ-radiation. The effects of γ-radiation dose and content of crosslinking agent on the molecular weight and crystalline morphology of PLLA were investigated. The results showed that the viscosity-average molecular weight of PLLA-TAIC increased at beginning and then decreased with enhanced γ-radiation dose. When γ-radiation dose was 10kGy and the content of TAIC was 3, the viscosity-average molecular weight of PLLA increased the maximum. PLM indicated that spherulite size of PLLA increased with the increase of radiation dose. The crystallization ability of PLLA reduced with adding TAIC.

关 键 词：PLLA Γ-辐照 粘均分子量 结晶 

分 类 号：O631.3[理学—高分子化学]