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The Research of Chemical Synthesis Process of Fluorene Polycarbonate

Author: LiuKai
Tutor: LiFuSheng
School: Tianjin University
Course: Chemical processes
Keywords: Polycarbonate Bisphenol A Bisphenolfluorene Heat resistance Glass transition temperature Transesterification
CLC: TQ323.41
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 0
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Abstract


Polycarbonate is an excellent engineering thermoplastics, and not only has high impact strength, excellent thermal stability and cold resistance, and also have good electrical insulation properties , flame resistance, has been widely used in the disc , automotive , packaging , pharmaceutical and other industries . Conventional bisphenol A type polycarbonate glass transition temperature of 140 ° C to -160 ° C , high temperature is easily deformed , can not meet the needs of some specific areas of the national economy , therefore, the thermal performance of the polycarbonate modified becomes increasingly important. In view of the current thermal performance improved polycarbonate synthesis technology in the country is still blank , for this case , the main content of this paper is the use of bisphenol fluorene bisphenol A as a synthetic polycarbonate material to replace the traditional study of different groups its glass transition temperature , in order to compensate for the bisphenol A type polycarbonate thermal performance is poor, and the defect of a low glass transition temperature , to thereby obtain a polycarbonate having a novel structure and a higher glass transition temperature . In accordance with the course of the transesterification method, the reaction of the synthesis of polycarbonate , bisphenol fluorene type polycarbonate synthesis can be divided into two separate reaction stages , the ester interchange stage and the polycondensation stage , its polycondensation process a variety of factors , including a catalyst the type and amount , reaction temperature , reaction time and reaction pressure . Found that La (acac) 3 The catalytic effect preferably , the amount of catalyst is preferably 1.0 × 10 -6 < / SUP > mol / mol ( BHPF ) . Pre - polycondensation stage transesterification are two reactions . The polycondensation reaction conditions : The final reaction temperature was 320 ° C , final pressure LT ; 1mmHg, reaction time, 8H . And using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy ( 13 < / sup> C NMR ) and differential scanning calorimetry (DSC) method on the synthesis of polycarbonate characterized .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Polyester resins and plastic materials > Unsaturated polyester
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