Accession Number:

ADP007471

Title:

Synthesis of Polymide Silicate Hybrids Via Sol-Gel Ultrastructure Processing,

Descriptive Note:

Corporate Author:

VIRGINIA POLYTECHNIC INST BLACKSBURG

Personal Author(s):

• Spinu, M.
• Brennan, A.
• Rancourt, J.
• Wilkes, G.L.
• Mcgrath, J.E.

Report Date:

1991-02-01

Pagination or Media Count:

8.0

Abstract:

New organicinorganic hybrid materials ere prepared by hydrolysis and co-condensation of tetramethylorthosilicate TMOS with trimethoxysilane functionalized polyimide oligomers via sol-gel ultrastructure processing. In the first reaction step, amine terminated, fully imidized, soluble, high Tg polyimides were prepared from appropriate diamines and dianhydrides by solution imidization techniques. The amine end-groups were then quantitatively derivatized to nadimide structures through reaction with cis-norbornene 2,3 dicarboxylic anhydride. Subsequently, the nadimides were quantitatively derivatized to trimethoxysilane functionalities via hydrosilylation reactions in the presence of chloroplatinic acid catalyst. The resulting hexamethoxy functionalized polyimide oligomers were hydrolyzed and co-condensed at elevated temperatures under mild pressure with TMOS via sol-gel processing to generate thermally stable polyimidesilicate hybrids. The synthesis and characterization of these materials is discussed.

Descriptors:

• *AMINES
• *ANHYDRIDES
• ACIDS
• CATALYSTS
• CONDENSATION
• GELS
• HYDROLYSIS
• MATERIALS
• OLIGOMERS
• PRESSURE
• PROCESSING
• STRUCTURES
• SYNTHESIS
• TEMPERATURE

Subject Categories:

• Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE