Ferroelectric properties exhibited by mesophases of compounds composed of achiral banana-shaped molecules
摘要:
报告了一系列由香蕉形分子组成的新型五环酯的合成和介形特性。含有正十二烷氧基、正十四烷氧基和正十六烷氧基末端链的同系物呈现出胶凝相,而含有正十八烷氧基链的同系物则呈现出二维结构。这些介相的结构是通过 X 射线衍射研究确定的。有趣的是,这两种介相都具有铁电特性。利用三角波和直流电场对电光开关特性进行了研究。通过双稳态开关行为,两种介相都清楚地证明了铁电性。
作者:Hari Krishna Bisoyi、H T Srinivasa、Sandeep Kumar
DOI:10.3762/bjoc.5.52
日期:——
the design and synthesis of novel banana-discotic dimers and banana-bridged discotic dimers. The chemical structureshave been characterized by spectral techniques and elemental analysis. The thermal behaviors of the compoundshave been investigated by polarizing optical microscopy and differential scanning calorimetry. None of these synthesized compounds exhibit any liquidcrystalline property probably
The present disclosure relates to a polycarbonate and a preparation method thereof, which has a novel structure with an improvement in weather resistance, while having excellent mechanical properties.
Provided is a polycarbonate of Chemical Formula 1:
wherein in Chemical Formula 1:
Ar is C
6-60
arylene unsubstituted or substituted with C
1-10
alkyl; and
n and m are each independently an integer from 1 to 50, provided that n+m is 2 or more
and a preparation method thereof.
[EN] POLYCARBONATE AND PREPARATION METHOD THEREFOR<br/>[FR] POLYCARBONATE ET SON PROCÉDÉ DE PRÉPARATION<br/>[KO] 폴리카보네이트 및 이의 제조방법
申请人:LG CHEMICAL LTD
公开号:WO2020032723A1
公开(公告)日:2020-02-13
본 발명은 기계적 물성이 우수하면서도, 내후성이 향상된 신규한 구조의 폴리카보네이트 및 이의 제조방법에 관한 것이다.