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Citation: LI Xiu-Ru, TONG Yue-Jing, CHEN Qing-Hua. On the Storage-stability of Poly(amic acid) s[J]. Chinese Journal of Applied Chemistry, ;2002, 19(3): 230-233. shu

On the Storage-stability of Poly(amic acid) s

1.
Department of Chemistry, Fujian Normal University, Fuzhou 350007

Corresponding author: TONG Yue-Jing,
Received Date: 14 June 2001
Available Online: 29 November 2001
Fund Project: 福建省教委资助项目(JA99146) (JA99146)

A series of poly(amic acid)s(PAA) based on pyromellitic dianhydride(PMDA), biphenyl tetracarboxylic dianhydride(BPDA), thiodiphthalic dianhydride(TDPA), bis(dicarboxyphenoxy) benzene dianhydride(HQDPA) and oxydiphthalo tetracarboxylic dianhydride(ODPA) were prepared in different solvents. Two poly(amic acid)s, from PMDA with 4,4'-diaminodiphenyl methane or 4,4'-diamino 3,3'-dimethyl diphenyl methane, were found to be gelatinized in N-methyl pyrrolidone, and the other PAAs were soluble at room temperature. The storage stability of the poly(amic acid)s were investigated as function of temperature, gel state, addition of molecular sieve. The poly(amic acid) gels showed better storage stability than poly(amic acid)s solutions. 4A molecular sieve could prevent poly(amic acid)s from depolymerization, leading to a long time storage.
- poly(amic acid),
- gel,
- storage stability
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