反应增容结合立构复合结晶制备超韧PLA/PCL共混材料  

Preparation of Super-toughened PLA/PCL Blends via Reactive Compatibilization and Stereocomplexation Crystallization

作　　者：杨皓然 叶长春 王佳 贾光 段同生 刘双良 高丽君 崔静 周立明 方少明 Yang Haoran;Ye Changchun;Wang Jia;Jia Guang;Duan Tongsheng;Liu Shuangliang;Gao Lijun;Cui Jing;Zhou Liming;Fang Shaoming(Henan Provincial Key Laboratory of Surface&Interface Science,School of Materials and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China;Henan Province Zhongyuan Plastic Machinery Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]郑州轻工业大学材料与化学工程学院河南省表界面科学重点实验室,郑州450002 [2]河南省中原塑料机械有限公司,郑州450000

出　　处：《工程塑料应用》2022年第11期1-7,24,共8页Engineering Plastics Application

基　　金：国家自然科学基金项目(U1704256,51803192);中原科技创新领军人才项目(214200510017)。

摘　　要：以聚己内酯(PCL)为增韧相,异山梨醇基二异氰酸酯(IBDI)为增容剂,采用结晶与反应增容相结合的方法对左旋聚乳酸(PLLA)进行增韧。首先将PCL和IBDI与右旋聚乳酸(PDLA)进行反应共混,制备含有PCL-IBDI-PDLA二嵌段共聚物的共混母粒。随后将其与PLLA共混,原位形成位于PLLA与PCL相界面以及PLLA基体中的立构复合晶体(SC晶体)。在反应增容的基础上,通过相界面处的SC晶体进一步提高基体PLLA与PCL的界面结合强度,制备超韧聚乳酸(PLA)/PCL共混材料。通过扫描电子显微镜和万能试验机等对材料的形貌和性能进行了表征和测试,实验结果表明,采用两步法制备的共混物中观察不到聚集的PCL分散相,且PCL分散相和基体PLLA的相界面趋向于模糊。随着IBDI含量的增加,PLLA和PCL的结合力由于界面处SC晶体的存在而得到增强,增容效果提高。当IBDI含量为1.5份时,共混材料的缺口冲击强度为68.4 kJ/m^(2),断裂伸长率为306%;IBDI含量为2.0份时,缺口冲击强度为77.9 kJ/m^(2),断裂伸长率为284%。Poly(caprolactone)(PCL)was used as toughening phase and isosorbide diisocyanate(IBDI)was used as compatibil‐izer to toughen L-polylactic acid(PLLA)by crystallization and reaction compatibilization.Firstly,PCL and IBDI were blended with D-polylactic acid(PDLA)to prepare the master batch containing PCL-IBDI-PDLA diblock copolymer.Then it was blended with PLLA to form stereocomplexation crystallization crystals(SC crystals)at the interface between PLLA and PCL and in the PLLA matrix.On the basis of reactive compatibilization,the interfacial bonding strength between PLLA and PCL was further improved by SC crystals at the phase interface,and the super tough PLA/PCL blending materials were prepared.The morphology and properties of the materials were characterized and tested by scanning electron microscope and universal testing machine.The experimental results show that no aggregated PCL dispersed phase is observed in the blends prepared by the two-step method,and the phase inter‐face between PCL dispersed phase and PLLA tends to be blurred.With the increase of IBDI content,the binding force of PLLA and PCL is enhanced due to the presence of SC crystals at the interface,and the compatibilization effect is improved.When the content of IBDI is 1.5 phr,the notched impact strength of the blend is 68.4 kJ/m^(2) and the elongation at break is 306%;when the IBDI content is 2.0 phr,the notched impact strength is 77.9 kJ/m^(2) and the elongation at break is 284%.

关 键 词：聚乳酸 聚己内酯 增韧 反应性共混 立构复合结晶 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]