丙烯酸酯弹性体共混物的性能研究.pdf

第42卷第12期
料工业
2014年12月
CHINA PLASTICS INDUSTRY
改使聚甲醛/丙烯酸酯弹性体共混物的性能研究
与合金
李丽英,方伟,孟永智,田广华
神华宁夏煤业集团煤炭化学工业分公司研发中心,宁夏银川750411)
摘要:采用双螺杆挤出机共混的方法制备了聚甲醛(POM)/丙烯酸酯弹性体(ACR)共混物,通过力学测试
差示扫描量热仪(DSC)、热重分析仪(TG)和扫描电子显微镜(SEM)等手段研究了POM/ACR共混体系的力学性
能、结晶性能和热稳定性等。结果表明,POM的简支梁缺口冲击强度和断裂伸长率均随ACR含量的增加而提高,
ACR含量为16%时,缺口冲击强度达到15kJ/m2,比纯POM提高了158%,断裂伸长率为80.5%,比纯POM提高了
90%;DSC分析显示该弹性体影响了POM分子链段的运动,使POM的相对结晶度和结晶速率均降低;TG分析也显
示氮气条件下,共混物的热分解温度和降解活化能均高于纯POM。
关键词:棗甲醛;丙烯酸酯弹性体;共混;性能
DO:10.3969/f.isn.1005-5770.2014.12.006
中图分类号:'TQ326.51
文献标识码:A
文章编号:1005-5770(2014)12-0021-04
Study on Properties of POM/Acrylate Elastomer Blend
LI Li-ying, FANG Wei, MENG Yong-zhi, TIAN Guang-hua
(R&D Center of SNCG Coal Chemical Industry Company, Yinchuan 750411, China)
Abstract The blends of polyoxymethylene (POM)/acrylate elastomer (ACR) were prepared by the
methods of blending in a twin screw extruder. Mechanical test, crystallinity and thermal stability of POM/
ACR blends were studied through mechanical test, DSC, TG and SEM. The results showed that the Charpy
notched impact strength and the elongation at break of the blends were increased with the content of ACR
increased, when the content of ACR was 16%, the notched impact strength of the blends came up to 15 KJ/
m", 158% higher than that of pure POM; the elongation of the blends was 80.5%, 90% higher than that of
pure POM; DSC analysis indicated that the acrylate elastomer influenced the POM molecular chain
movement, so that the relative crystallinity and the crystallization rate decreased; TG analysis showed that the
blend had higher thermal degradation temperature and degradation activation energy than those of pure POM in
nitrogen
Keywords: Polyoxymethylene; Acrylate Elastomer; Blending; Property
聚甲醛(POM)是五大通用工程塑料之一,具显著提升,适用于制各耐冲击制件和低温下使用的零
有优异的强度和刚性,机械性能接近金属材料。但部件
是,其韧性低、热稳定性差和密度大等缺点,使得其
丙烯酸酯弹性体(ACR)是一类具有壳核结构
在某些冲击强度要求较高的制品、热稳定性要求较好的高分子加工改性剂,具有优良的成型加工性和优异
的大型板材和棒材以及轻质的大型器件应用上受到限的耐候性,能在很宽的温度范围内保持优异的冲击性
制。聚甲醛增韧改性是近年来行业内的热点研究方能。笔者采用丙烯酸酯弹性体增韧改性共聚甲醛,通
向,主要以热塑性聚氨酯、丁腈橡胶、改性聚烯烃、过对共混体系的力学性能、扫描电子显微镜(SEM
聚酯弹性体、聚酰胺等为增韧改性剂“,通过与微观形貌、差示扫描量热仪(DSC)、热重分析仪
聚甲醛树脂共混得到具有两栢结构的增韧改性聚甲醛(TG)的测试,研究了该共混体系的性能。
材料。这类复合材料在抗冲击性能和耐低温性能方面
作者简介:李丽英,女,1982年生,工程师,从事聚烯烃、聚甲醛结构性能研究和后加工改性研究
li,liying@sgcc.com