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Study on Polymethacrylimide and Its Nanocomposite

Author: ZhangKaiZuo
Tutor: ChenYiMin
School: National University of Defense Science and Technology
Course: Polymer Chemistry and Physics
Keywords: Polymethacrylimide Montmorillonite In situ intercalation Polymethyl methacrylate
CLC: TQ316.3
Type: Master's thesis
Year: 2007
Downloads: 140
Quote: 1
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Abstract


Polyimide is a class of aromatic heterocyclic ring containing imide polymer with excellent thermal performance in high temperature environment , the performance advantage is more obvious. Nearly four decades , high-performance polyimide material in many fields has been rapid development and applications, such as aerospace and microelectronics . Polymethacrylimide (PMI) is one of a rapid development , the polyimide material having excellent performance at the same time , has good workability . In this paper, methacrylonitrile (MAN) and methacrylic acid (MAA) copolymer prepared by the reaction of MAN-MAA copolymer , and after the cyclization reaction of the imide polymethacrylimide (PMI); simultaneously , in order to improve the performance of PMI , using in situ intercalation polymerization of PMI / MMT nanocomposites . The use of FT-IR, DSC-TGA, SEM and mechanical testing and other means to analyze the structure and characterization of the material properties. First, solution polymerization and bulk polymerization , MAN-MAA copolymer was prepared to study the reaction temperature, the ratio of raw materials and the process of the polymerization initiator system impact , through the thermal and mechanical properties of the copolymer analytical characterization to determine the appropriate polymerization method , the corresponding composition and the polymerization reaction conditions ; and study the mechanism of the cyclization reaction , cyclization by controlling time and temperature, and PMI cyclization performance studies to determine the best copolymer cyclization conditions . Prepared by suspension polymerization of high molecular weight poly (methyl methacrylate) (PMMA), studied the dispersing agent, the reaction temperature and time influence the molecular weight of the PMMA ; PMMA used in the reaction of high molecular weight tackifying system , effective solution to the Na Mimeng bentonite sedimentation in the reaction solution in the problems and uniformly dispersed in the copolymer in question . For PMI / MMT nanocomposite structure and thermodynamic properties of the results showed that the prepared PMI / MMT nanocomposites dispersed nano- MMT , compared with the pure PMI , its glass transition temperature from 213 ℃ up to 220 ℃, increased by the bending strength 51MPa to 135MPa. In addition , the paper also explored prepared AN-MAA copolymer / MMT nanocomposites and AN-MAA copolymer cyclized product called semi - Polymethacrylimide ( semi -PMI), and PMI / MMT nanocomposites compared nanocomposites half -PMI/MMT glass transition temperature decreased slightly , the bending strength by 20%.

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CLC: > Industrial Technology > Chemical Industry > Molecular compound Industries ( polymer industry ) > Production process > Polymerization process.
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