熔融共混法加工条件对聚碳酸亚丙酯性能影响的研究  

Effect of Processing Conditions in Melt Blending on Properties of Poly Propylene Carbonate

作　　者：李金梅[1,2] 黄晓玲[3] 苏海全[1,3] 

机构地区：[1]内蒙古大学生命科学学院,内蒙古呼和浩特010021 [2]内蒙古农业大学理学院,内蒙古呼和浩特010018 [3]内蒙古大学化学化工学院,内蒙古呼和浩特010021

出　　处：《化学试剂》2014年第3期210-214,共5页Chemical Reagents

基　　金：国家自然科学基金资助项目(50763004;50362002)

摘　　要：用双螺杆挤出机加工纯聚碳酸亚丙酯（PPC），研究了加工温度和螺杆转速对PPC热稳定性、力学性能和生物降解性的影响。热重分析表明随着加工温度的升高，PPC的热稳定性降低，其适宜的加工温度范围为135～150℃；螺杆转速越低，热稳定性越低。静态拉伸试验显示加工温度越高，转速越低，加工出的PPC力学性能越差。动态力学性能测试结果显示加工温度从135qC升至145℃，PPC的玻璃化转变温度（Tg）降低了5．9～8℃，转速从200rpm降至50rpm，Tg降低了2．1～8℃。在使用温度区间内（约20～35℃），加工出的PPC储能模量减小，刚性和抗变形能力减弱（200rpm加工出的PPC除外）。利用凝胶渗透色谱法测试生物降解前后PPC的分子量，结果表明加工后PPC的生物降解性优于未加工PPC的降解性，且加工温度越高，转速越低，生物降解程度越大。Effect of processing temperature and screw rotation speed on thermal stability, mechanical property and biode- gradability of pure poly propylene carbonate （PPC） extruded by twin screw extruder was systematically investigated. Ther- mal gravimetric analyses （TG） showed that the thermal sta- bility of PPC decreased with increase of processing tempera- ture and that the suitable processing temperature range was 135 - 150 ℃. Meanwhile,the lower screw rotation speed was, the lower its thermal stability was. Static tensile tests demon- strated that higher processing temperature and lower screw ro- tation speed can result in poor mechanical property. Dynamic mechanical property testing illustrated that glass-transition temperature （Tg） of PPC reduced by 5.9 -8 ℃ when pro- cessing temperature increased from 135 ℃ to 145 % and Tg was reduced by 2.1 - 8 ℃ when screw rotation speed de- creased from 200 rpm to 50 rpm. Storage modulus of pro- cessed PPC decreased, rigidity and resistance to deformation were weakened （except for that extruded under speed of 200 rpm） in temperature range of 20 - 35 ℃. Molecular weights of PPC before and after biodegradation were detected by gel permeation chromatography. Results indicated biodegradability of processed PPC was improved. The higher processing tem- perature and lower screw rotation speed were, the greater bio- degradability was.

关 键 词：聚碳酸亚丙酯 加工温度 螺杆转速 热稳定性 力学性能 生物降解性 

分 类 号：TQ050.421[化学工程]