摘要
合成了一种端基含有活性基团的热致性液晶聚合物 (LCPU) ,用其改性环氧树脂 CYD- 12 8/ 4 ,4′-二氨基二苯砜 (DDS)固化体系 ,对改性体系的冲击性能、拉伸性能、弹性模量、断裂伸长率、玻璃化转变温度 Tg与 LCPU含量的关系进行了探讨 ,对不同种类液晶化合物对 CYD- 12 8/ DDS体系改性效果进行了比较 ,用扫描电镜 (SEM)对材料断面的形态结构进行了研究。结果表明 ,LCPU的加入可以使固化体系的冲击强度提高 2～ 3.5倍 ,拉伸强度提高 1.6～ 1.8倍 ,弹性模量提高 1.1～ 1.5倍 ,断裂伸长率提高2～ 2 .6倍 ,Tg提高 36℃～ 60℃ 。
A reactive thermotropic liquid crystal polymer(LCPU) was synthesized to toughen the epoxy resin CYD-128/4,4′-diaminodiphenyl sulfone(CYD-128/DDS) curing system. Influences of amount of LCPU on impact strength, tensile strength, elastic modulus, elongation and glass transition temperature(T g) were studied. Influences of different kinds of liquid crystal compound on properties of modified curing system also were discussed. The morphologies of the fracture surface were observed by SEM. Results show that impact strength is enhanced to 2~3.5 times, tensile strength is enhanced to 1.6~1.8 times, elastic modulus is improved for 2~2.6 times, elongation percentage is improved for 2~2.6 times, glass transition temperature(T g) is increased to 36 ℃~60 ℃ for the modified system. SEM observation of the fracture surface of the impact specimen showes that the toughed fracture characters are obviously appeared.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2003年第1期168-171,共4页
Polymer Materials Science & Engineering
基金
湖南省教委项目 ( 99C10 9)
湘潭大学博士生基金资助项目
