The Effect on Thermal Stability of Polyimide Films Based on Phthalimide End-capped ODPA and ODA

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Journal of Materials Engineering ›› 2006, Vol. 0 ›› Issue (7) : 7-10.

The Effect on Thermal Stability of Polyimide Films Based on Phthalimide End-capped ODPA and ODA

CHENG Ru, HUANG Pei, SHI Jun

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Abstract

Polyimide films capped with nonreactive phthalimide end groups were synthesized with theoretical number average molecular mass of 10000 and 30000 calculated using the Carothers equation.The effect of end-capper on the thermal properties was studied by investigating the change of the glass transition temperature(T_g) of films after cured at high temperature.The Gel Permeation Chromatography(GPC) results indicated that the molecular distribution of end capped PAA was smaller than that of the no end-capped one.The Differential Scanning Calorimetry(DSC) results showed PA end-capped polyimide films exhibited slower rising range of the T_g compared to no end cappers films'.With the increasing of curing time,the T_g of the short chain film increased slowly,which of the long chain film increased straightly.The end capper's effect was explained based on polymerization at high temperature,chain branching/crossing-linking reactions and molecular activity.

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polyimide film / thermal stability / glass transition temperature

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CHENG Ru, HUANG Pei, SHI Jun. The Effect on Thermal Stability of Polyimide Films Based on Phthalimide End-capped ODPA and ODA[J]. Journal of Materials Engineering, 2006, 0(7): 7-10

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