玻璃化转变
取代基
BPDA公司
材料科学
缩聚物
酰亚胺
高分子化学
透射率
聚合物
聚酰亚胺
复合材料
有机化学
化学
光电子学
图层(电子)
作者
Ki-Ho Nam,Hyeonil Kim,Hoi Kil Choi,Hyeonuk Yeo,Munju Goh,Jaesang Yu,Jae Ryang Hahn,Haksoo Han,Bon‐Cheol Ku,Nam-Ho You
出处
期刊:Polymer
[Elsevier]
日期:2016-11-27
卷期号:108: 502-512
被引量:33
标识
DOI:10.1016/j.polymer.2016.11.062
摘要
New diamines for high-performance poly(ester imide)s (PEsIs) containing dimethyl groups at the ortho-position of amino groups and ester derivatives have been developed to improve optical transparency and glass transition temperature (Tg) while maintaining a low coefficient of thermal expansion (CTE). Four kinds of PEsIs derived from bis(4-amino-3,5-dimethylphenyl) terephthalate (BADMT) and aromatic dianhydrides such as 1,2,4,5-benzenetetracarboxylic dianhydride (PMDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 4,4'-oxydiphthalic anhydride (ODPA), and 4,4'-(hexafluoroisopropylidene)diphthalic (6FDA) were synthesized via a two-step polycondensation. All PEsIs exhibited outstanding properties, such as light color, a good transmittance of >90% at 550 nm, high Tg above 289 °C and 5% weight loss temperature (483–511 °C), and low CTE (11–68 ppm/°C). The effect of the substituent on molecular packing and properties, including optical and thermomechanical properties for the resulting PEsIs were examined in detail. The temperature-dependent CTE of the PEsIs was determined using molecular dynamics (MD) simulation. The molecular orbital (MO) calculation models support the discussions on the electronic substituent effect of the PEsI main chains. Our molecular architecture and systematic property studies with MD and MO promote a better understanding of the polyimides.
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