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Synthetise Research of 2,3,3’,4’-Biphenyltetracarboxylic Dianhydride and Biphenyl Polimide

Author: SunHuiZuo
Tutor: LiYanTao
School: Hebei University of Technology
Course: Chemical processes
Keywords: 2,3’,3,4’-Biphenyltetracarboxylic dianhydride dehalogenation coupling method biphenyl polyimide synthesis copolymers characterizated
CLC: O633.22
Type: Master's thesis
Year: 2008
Downloads: 289
Quote: 0
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Abstract


Biphenyl polyimides（PI） as new aromatic polyimides have excellent thermal and chemical stability,good mechanical properties,low dielectric constants and intrinsic purity.Biphenyl polyimides of variant-structure have different properties.Biphenyltetracarboxylic dianhydride （BPDA） is an important monomer for the synthesis of biphenyl polyimides.The three isomers of biphenyltetracarboxylic dianhydride include 3,3’4,4’-Biphenyltetracarboxylic dianhydride （s-BPDA）,2,3’,3,4’-Biphenyltetracarboxylic dianhydride（a-BPDA） and 2,2’,3,3’-Biphenyltetracarboxylic dianhydride（i-BPDA）.However,there have been few reports about study on a-BPDA.This paper studied a-BPDA and the properties of a-BPDA-PI.Then mixed a-BPDA and commonly used s-BPDA,prepared copolymer type polyimide.The performance of the copolymer type polyimide was tested.The a-BPDA was prepared by the dehalogeno-coupled reaction,3-chlorophthalic dianhydride and 4-chlorophthalic dianhydride as raw material,Nickel complex as catalyst system.Further to the anhydride monomer polymerized with the amino diphenyl ether（ODA） to get the corresponding biphenyl structure polyimide.The products were characterizated by infrared analyzer（IR）,proton nuclear magnetic resonance analyzer （H1-NMR）,thermogravimetric analyzer（TGA）,differential scanning calorimetry analyzer （DSC）,X-ray diffractometer and sweep electron microscopy analyzer（SEM）.Some conclusions have been obtained:a-BPDA can be synthesized successfully through dehalogeno-coupled reaction,and a-BPDA-PI shows good thermal properties.Glass transition temperature（Tg） of a-BPDA-PI is 324.4℃,the temperature at 5%loss weight(Td5) is 538℃. Copolymers derived from a-BPDA and s-BPDA shows good thermal and mechanical properties. Tensile strength of copolycondensation polyimide film can reach 62.6MPa.Glass transition temperature（Tg） of copolycondensation polyimide film is 318℃,the temperature at 5%loss weight(Td5) is 542℃.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Miscellaneous Chain Polymers > Nitrogen-containing polymer chain > Polyamide
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