超高韧性聚甲醛/聚氨酯复合材料的性能与结构研究
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摘要
采用双螺杆挤出机制备了超高韧性聚甲醛(POM)/热塑性聚氨酯弹性体(TPU)共混物,通过力学测试和扫描电子显微镜(SEM)等手段研究了树脂流动性、TPU种类对POM/TPU共混体系性能及结构的影响。结果表明:当TPU含量50%时,配合不同粘度的POM树脂,可使共混体系达到超高的冲击强度,材料在拉伸过程出现应变-硬化过程,POM和TPU在共混体系中呈现两相双连续结构。相比于聚酯型TPU,使用聚醚型TPU制备的共混体系具有更高的低温缺口冲击强度。
The ultra-high toughness POM/TPU blends were prepared by twin screw extruder. The effects of matrix resin fluidity and TPU types on POM/TPU properties and structure were studied by mechanical test and scanning electron microscopy( SEM). The results showed that when the content of TPU was 50%,the ultra-high impact strength of POM/TPU blends can be obtained by using POM resins with different viscosities. The strain-hardening process occurred in the tensile test process,and a two-phase continuous structure of POM and TPU appeared in the blends. Compared with TPU of polyester structure,the blends prepared with TPU of polyether structure had higher notch impact strength at low temperature.
The ultra-high toughness POM/TPU blends were prepared by twin screw extruder. The effects of matrix resin fluidity and TPU types on POM/TPU properties and structure were studied by mechanical test and scanning electron microscopy( SEM). The results showed that when the content of TPU was 50%,the ultra-high impact strength of POM/TPU blends can be obtained by using POM resins with different viscosities. The strain-hardening process occurred in the tensile test process,and a two-phase continuous structure of POM and TPU appeared in the blends. Compared with TPU of polyester structure,the blends prepared with TPU of polyether structure had higher notch impact strength at low temperature.
引文
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[12]张钊,李晓莉,马迪.热塑性聚氨酯/无机纳米粒子增韧改性聚甲醛研究[J].聚氨酯工业,2017,2(8):24-27.
[2]韩金亮,张新党,徐泽夕,等.浅谈聚甲醛行业的发展[J].广州化工,2013,41(20):27-29.
[3]刘莉,徐开杰.聚甲醛改性研究现状[J].工程塑料应用,2008,36(2):71-75.
[4]曹雪荣,陈明高.共聚甲醛改性研究进展[J].广州化工,2014,42(4):17-19.
[5]张予东,廖颖玲,高芸,等.共聚甲醛的自成核结晶行为[J].中国塑料,2016,30(9):14-20.
[6]李武斌. PUR-T增韧POM复合材料的制备及其性能[J].工程塑料应用,2017,45(5):126-130.
[7]曹绍强,陈锋,叶坤豪,等.聚甲醛/聚氨酯合金的性能及工艺研究[J].广州化工,2018,46(10):18-20,55.
[8]丁军,刘维民,潘广勤,等.不同热塑性弹性体增韧聚甲醛[J].合成橡胶工业,2005,28(3):195-199.
[9]徐一兵,徐青林,于国柱,等. SEBS-g-MAH在塑料工业中的应用[J].塑料科技,2007,35(11):104-109.
[10]于建,王书武,黄国锋,等.丁腈橡胶对聚甲醛树脂的增韧机理研究[J].高分子学报,2000(1):90-94.
[11]李昕,曲敏杰.聚酰胺对聚甲醛的增韧及热稳定作用研究进展[J].塑料制造,2007(Z1):77-80.
[12]张钊,李晓莉,马迪.热塑性聚氨酯/无机纳米粒子增韧改性聚甲醛研究[J].聚氨酯工业,2017,2(8):24-27.