The present necessity to use heat-resistant materials in electronics justifies the scientific interest in different heterocyclic polymers. This paper is especially concerned with the preparation of novel heat-resistant polyimides having bisbenzimidazole moieties in the main chain and their applications as dielectric films. A soluble copolyimide was prepared by a two-step synthesis from aromatic dianhydrides and aromatic diamines. The bisbenzimidazole diamine was prepared by reduction of the corresponding dinitro compound. The diamine was reacted with various aromatic dianhydrides to prepare a series of alternating benzimidazoleâimide copolymers via the poly(amic acid) precursors and thermal or chemical imidization. Monomers and polymers were characterized by conventional methods and their physical properties such as solution viscosity, solubility properties, thermal stability and thermal behaviour were studied. All copolymers were obtained in high yields having inherent viscosities ηinh that ranged from 0.60 to 0.98 dL gâ1. Thin films of the copolymer were tough and flexible, having tensile strengths as high as 100 MPa. Glass transition temperatures were observed between 275 and 328 °C. Thermogravimetric analyses indicated that the thermal degradation of poly(benzimidazoleâimide) occurs around 530 °C, which is ca. 80 °C higher than polyimide, confirming that the introduction of the bisbenzimidazole component improved the thermal stability of polyimide.
Bis-benzimidazoles and related compounds as potassium channel modulators
申请人:ICAgen, Inc.
公开号:US20040029925A1
公开(公告)日:2004-02-12
The present invention provides a genus of bis-benzimidazole compounds, methods and pharmaceutical compositions that are useful as modulators of potassium ion channels. The compounds of the invention are of use in both therapeutic and diagnostic methods.
LIQUID CRYSTAL ALIGNMENT AGENT, LIQUID CRYSTAL ALIGNMENT FILM AND LIQUID CRYSTAL DISPLAY ELEMENT
申请人:CHI MEI CORPORATION
公开号:US20140024753A1
公开(公告)日:2014-01-23
A liquid crystal alignment agent contains a polymer and a solvent. The polymer is obtained by subjecting a mixture including a tetracarboxylic dianhydride component and a diamine component to a reaction. The diamine component includes a diamine compound of formula (I) defined herein, a benzimidazole-group-containing diamine compound, and a diamine compound other than the diamine compound of formula (I) and the benzimidazole-group-containing diamine compound. The liquid crystal alignment agent has superior processing stability, and a liquid crystal display element made from the aforesaid liquid crystal alignment agent has superior reliability.
COATING COMPOSITION INCLUDING FUNCTIONALIZED GRAPHENE OXIDE, METHOD FOR FORMING STACKED STRUCTURE USING THE SAME AND METHOD FOR MANUFACTURING DISPLAY DEVICE USING THE SAME
申请人:Samsung Display Co., LTD.
公开号:US20210104672A1
公开(公告)日:2021-04-08
A coating composition includes a graphene oxide and a solvent. At least one of a carboxyl group and an epoxide group of the graphene oxide is functionalized by an amine. The amine has an activation energy to an epoxide group of the graphene oxide of about −3 kcal/mol to about 8 kcal/mol. A method of forming a stacked structure using the coating composition is provided. A method of manufacturing a display device using the coating composition is provided.