首页
最新动态 交流合作 科研项目 论文著作 精彩瞬间 招生招聘
  • Synthesis and properties of poly(benzoxazole imide)s derived from two isomeric diamines containing benzoxazole moiety
  • 来源:陈国飞研究员个人网站 2020-08-03
  • Two isomeric diamine monomers, 2-(3-aminophenyl)benzo[d]oxazol-5-amine (2a) and 2-(3-aminophenyl) benzo[d]oxazol-6-amine (2b), were designed and synthesized. The corresponding novel series of poly (benzoxazole imide)s (PBOPIs) were prepared with commercial tetracarboxylic dianhydrides via thermal imidization. These series of PBOPIs showed great Tgs ranging from 285 to 363 °C, excellent thermal stability when performed at 5% weight loss temperatures (Td5%s) of 510–564 °C in N2 and good mechanical properties (tensile strengths of 103–126 MPa, tensile moduli of 2.9–3.7 GPa and elongations at break of 3.0–6.5%). Furthermore, controlled molecular weight (Mw) polymers PI-3a-PA and PI-3b-PA derived from 4,4’-oxydiphthalic anhydride (ODPA) with 2a and 2b demonstrated good melt processability with minimum complex viscosities of 2258 and 3444 Pa·s at 420 °C and low melt viscosity ratios of 1.29 and 1.93 at 400 °C, respectively. The PI-b series showed higher Tg & Td5% and lower transparency compared with the PI-a series due to the isomeric effect.
  • [来源:中国聚合物网]
  • 了解更多请进入: 陈国飞研究员个人网站
相关新闻
  • · 硫醚型聚酰亚胺薄膜的制备与性能研究
  • · Synthesis of polyamide-imides with different monomer sequence and effect on transparency and thermal properties
  • · Synthesis and properties of processable poly(benzimidazole-imide)s based on 2-(3-aminophenyl)-5-aminobenzimidazole
  • · Processable, high Tg polyimides from unsymmetrical diamines containing 4-phenoxy aniline and benzimidazole moieties

关于我们  |  联系我们  

网站:中国聚合物网

polymer.cn Copyright ©2017