左旋聚乳酸/右旋聚乳酸立构晶复合材料的刮擦行为  

Scratch Behavior of Poly(L-lacticacid)/Poly(D-lacticacid) Stereocrystalline Composites

作　　者：李顿 易龙飞 沈佳斌[1] 郭少云[1] Dun Li;Longfei Yi;Jiabin Shen;Shaoyun Guo(Polymer Research Institute of Sichuan University ,State Key Laboratory of Polymer Materials Engineering,Chengdu 610065 ,China)

机构地区：[1]四川大学高分子研究所高分子材料工程国家重点实验室(四川大学),四川成都610065

出　　处：《高分子材料科学与工程》2019年第4期95-100,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51673136)

摘　　要：通过熔融共混,制备了不同右旋聚乳酸(PDLA)含量的左旋聚乳酸/右旋聚乳酸(PLLA/PDLA)共混物。研究了在不同PDLA含量下,共混物的结晶、动态流变及耐刮擦性能。广角X射线衍射表明,PDLA的加入有效诱导了立构复合晶的生成,立构晶复合效率达到65%;动态流变测试表明,PDLA的加入使得共混物熔体中逐渐形成了以立构晶为交联点的物理网络结构。刮擦测试表明,PDLA的加入使得划痕形成力值和材料移除力值分别提升达260%和95%,相同负载下的刮擦摩擦系数和划痕深度减小,划痕形貌由裂纹转变为光滑划槽,表明立构晶的形成使得材料表现出更优异的耐刮擦性能。Poly(L-lactic acid)/poly(D-lactic acid)(PLLA/PDLA) blends with different contents of PDLA were prepared by melt blending. The crystallization, dynamic rheology and scratch properties of the blends were studied. Wide angle X-ray diffraction results show that the addition of PDLA effectively induces the formation of stereocrystalline, and the stereocrystalline formation efficiency reaches 65%. The dynamic rheological test shows that the addition of PDLA leads to the formation of physical cross-linking stereocrystalline networks in melt of the blends. The scratch test presents that the addition of PDLA increases the critical normal load of groove formation and material removal by up to 260% and 95% respectively, reduces the scratch coefficient of friction and the scratch depth, and turns the scratch morphology from crack to smooth groove,which reveals that the formation of stereocrystalline allows the materials to exhibit better scratch resistance.

关 键 词：聚乳酸 立构晶 刮擦 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]