摘要
采用自行合成的分子两端、一端带有NA端基和两端都不带NA端基的三种齐聚物,以及化学组成相同、分子链长不同的齐聚物和高聚物通过物理共混法对LP-15树脂进行增韧。比较了齐聚物的端基结构、分子量大小对LP-15树脂耐热性、冲击强度的影响,讨论了其增韧机理。结果表明:所有增韧体系中增韧剂与LP-15间均具有很好的相容性,且保持了LP-15树脂原有良好的耐热性。但分子带NA端基与不带NA端基的齐聚物相比,后者的增韧效果更好;当分子两端均不带NA端基时,分子链长的高聚物的增韧效果优于分子链短的齐聚物。
Oligmers with different end caps （non-side, one-side and both-side capped with NA respectively） and of different molecular weights are used to toughen LP-15 resin. Discussed the toughening mechanism and the influence of end-cap and molecular weight on resin＇s Tg and impact strength. The results showed that all systems revealed one peak in their tand-T curves which indicted that these tougheners had good compatibility with LP-15. In the meanwhile, all toughened LP-15 resins maintained the high Tg value of LP-15. Comparing the oligmers with NA end cap with those without NA end cap, the latter exhibited more effectiveness in improving the impact strength of LP-15 resin. To those without NA end cap, the longer the molecular chain, the higher the system toughness.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2007年第5期23-27,共5页
Acta Materiae Compositae Sinica
基金
先进复合材料国防科技重点实验室基金(5146001010105BQ0101)
