二氧化碳/环氧丙烷/马来酸酐三元共聚物对PPC/PHB共混物力学性能的影响  

Influence of Carbon Dioxide/Propylene Oxide/Maleic Anhydride Terpolymer on Mechanical Performance of PPC/PHB Blends

作　　者：张亚明[1,2] 高凤翔[1] 周庆海[1] 秦玉升[1] 王献红[1] 王佛松[1] 

机构地区：[1]中国科学院生态环境材料高分子重点实验室中国科学院长春应用化学研究所,长春130022 [2]中国科学院大学,北京100049

出　　处：《高分子学报》2015年第1期106-112,共7页Acta Polymerica Sinica

摘　　要：采用稀土三元催化剂制备了二氧化碳-环氧丙烷-马来酸酐三元共聚物(PPCMA).用红外和核磁谱图确定了PPCMA的结构及马来酸酐单元的含量,3 wt%马来酸酐投料量的PPCMA(共聚物中马来酸酐单元含量4.1%)的玻璃化转变温度(Tg)和起始热分解温度(Td-5%)分别为13.4℃和217℃,拉伸强度为2.88 MPa,断裂伸长率为1669%,与二氧化碳-环氧丙烷共聚物(PPC)相比,引入少量马来酸酐的PPCMA有望成为一种韧性材料,并可对PPC和聚3-羟基丁酸酯(PHB)共混体系进行改性.当在PPC/PHB共混体系中添加10 wt%的PPCMA时,所得共混材料的拉伸强度为18.2 MPa,断裂伸长率则提高到85%,较没有添加PPCMA的样品提高了4.25倍,因此PPCMA的加入能有效提高PPC/PHB共混体系的韧性,改善PPC/PHB共混体系的力学性能.偏光显微镜的研究表明PPC/PHB共混体系加入PPCMA后,很快形成大量尺寸小的PHB球晶,且结晶速度大幅度提高,因此PPCMA在一定意义上可视为一种特殊的"成核剂".A ternary rare earth metal coordination catalyst was used for terpolymerization of carbon dioxide, propylene oxide （PO） and maleic anhydride （MA）. The chemical structure as well as MA content in the terpolymer was determined by FTIR and ^1H-NMR spectra. The terpolymer was denoted as PPCMA,it showed 4. 1% MA content when the MA loading in the comonomer （weight ratio of MA to PO, MA/PO） was 3/97. The glass transition temperature of this PPCMA was 13.4℃ , and the temperature at 5 wt% loss of thermal decomposition was 217℃ , it also showed tensile strength of 2. 88 MPa with elongation at break of 1669%. Therefore, this PPCMA can act as toughening material at room temperature. It was used to solve the brittleness of blend from poly （ propylene carbonate） （PPC） and poly （3-hydroxylbutyrate） （PHB）. When 10 wt% of PPCMA was added into blend of PPC/PHB,it showed tensile strength of 18.2 MPa,while elongation at break increased to 85% , a 4.25 times increase compared with PPC/PHB sample,therefore, PPCMA can significantly improve the brittleness of PPC/PHB blends. The polarized optical microscopy （POM） image indicated that PPC itself did not show significant influence on the crystallization of PHB, mainly due to their immiscibility. When PPCMA was added into PPC/PHB blends, the number of spherulites increased significantly, while the size of nascent spherulites of PHB became smaller, and developed much fast than that without PPCMA addition,indicating that PPCMA may be a special ＂nuclear agent＂, though it was an amorphous polymer. The reason may lie in that the soft segment of PPCMA chain may enhance the hydrogen interaction between the hydroxyl group of PHB and the carbonyl group in PPC, which may be beneficial to reduce the spherulite of PHB.

关 键 词：二氧化碳 马来酸酐 三元共聚物 力学性能 

分 类 号：O631.21[理学—高分子化学]