γ-辐照对聚L-乳酸的熔体流变行为的影响  

Effect of γ-Ray Irradiation on Fusant Rheological Behavior of Poly(L-Lactic Acid)

作　　者：陈金周[1] 郭凯[1] 何海霞[1] 刘玉坤[1] 李新法[1] 王经武[1] 

机构地区：[1]郑州大学,郑州450001

出　　处：《包装工程》2010年第17期36-39,76,共5页Packaging Engineering

摘　　要：通过熔融指数仪和毛细管流变仪,研究了γ-射线辐照和敏化剂TAIC对聚L-乳酸(PLLA)的熔体流变行为的影响。结果表明:纯PLLA熔体的熔体流速(MFR)随辐照剂量的增加而增大,而表观粘度(aη)则降低;含有TAIC的PLLA熔体的MFR随辐照剂量的增加而减小,而表观粘度(aη)上升;所有样品的熔体均呈现假塑性流体的剪切变稀行为;同样的辐照剂量下,随敏化剂量的增加,PLLA/敏化剂体系熔体的表观粘度(aη)对剪切速率的敏感性增加,粘流活化能随剪切速率增加而逐渐减小。Effects of γ-irradiation sensitizer TAIC on fusant rheological behavior of poly（L-lactic acid）（PLLA） were studied by using melt index meter and capillary rheometer.The melt mass-flow rate（MFR） of pure PLLA increases with increasing irradiation dosage,while apparent viscosity（ηa） decreases;MFR of PLLA containing sensitizer TAIC decreases with increasing irradiation dosage,while ηa increases.The melt of all samples show shear-thinning behavior of pseudoplastic liquid.The sensitivity of apparent viscosity ηa of PLLA/sensitizer system fusant to shearing rate is enhanced by increasing sensitizer loading on the same irradiation dose,and flow activation energy decreases with increasing shear rate.

关 键 词：聚L-乳酸 Γ-辐照 敏化剂 流变行为 

分 类 号：TQ921.3[轻工技术与工程—发酵工程]