聚(ε-己内酯-co-L-丙交酯)/聚L-乳酸复合材料的制备与性能研究

Preparation and Characterization Study of Poly( ε-caprolactone-co-L-lactide) / Poly L-lactic Acid Composites

合成了两种不同摩尔质量的聚(ε-己内酯-co-L-丙交酯)(PCLA)大分子增韧剂。采用溶液共混的方法,制备了不同PCLA含量的大分子增韧剂与聚L-乳酸(PLLA)的复合材料。考察了不同摩尔质量和不同含量PCLA大分子增韧剂对PLLA的热力学性能和增韧效果的影响,以及复合材料的相形态。结果表明,PCLA的引入降低了PLLA的结晶温度、熔点和结晶度;随着PCLA含量的增加,复合材料的拉伸强度逐渐下降,断裂伸长率较PLLA有明显提高;当PCLA-2质量分数为15%时,复合材料的断裂伸长率达23.41%,拉伸强度仍有37.72 MPa;PCLA相与PLLA相未出现明显的相分离,两者具有较好的相容性,其中高摩尔质量的PCLA-1与PLLA的相容性更好。

Two different poly （e-caprolactone-co-L-lactide） （PCLA） macromolecules toughening agent were synthesized.PCLA/PLLA blends were prepared by solution blend method.The effects of different molecular contents and PCLA macromolecules toughening agents on the thermal mechanical property and toughing effect of PLLA were studied.Results showed that PCLA reduced the Tc,Tm and degree of crystallinity of matrix PLLA.The tensile strength decreased with the content of PLCA increasing,the elongation at break of blends improved significantly; with 15% of PCLA-2,the elongation at break improved to 23.41% and tensile strength maintained at 37.72 MPa.The phases of PCLA and PLLA had no obvious separation which displayed good compatibility,especially PCLA-1 with high molecular content.