含双酚芴三元共聚聚砜的合成与性能

Synthesis and properties of ternary polysulfone copolymer containing bisphenol fluorene

以双酚芴(BHPF)、双酚A(BPA)、4,4-二氯二苯砜(DCS)为原料,采用亲核取代法合成了不同BHPF含量的三元共聚聚砜,研究了反应溶剂、反应时间和成盐剂等对聚合反应的影响,并采用凝胶渗透色谱仪(GPC)、红外光谱仪(FTIR)和差示扫描量热仪(DSC)等对含BHPF三元共聚聚砜的结构和性能进行了表征。结果表明,选用N-甲基吡咯烷酮(NMP)为反应溶剂,碳酸钾为成盐剂,设定反应时间为4 h时,可制备得到数均分子量(M)>2×104的三元共聚物,且随着BHPF含量的增加,聚合物的玻璃化转变温度(T)逐渐提高,为209~254℃,主链分解温度>510℃,表现出了优异的耐热性能。当BHPF含量为80%(摩尔分数)时,材料的T为254℃,可见光范围内透光率为84%,可满足飞机高马赫数下的耐温需求,为高耐热透明材料的应用奠定了基础。

A series of ternary polysulfone copolymers with different contents of bisphenol fluorene were synthesized through polycondensation of bisphenol A,bisphenol fluorine,and 4,4-dichlorodiphenyl sulfone. The effects of reaction solvent,reaction time and salt forming agent on the polymerization were studied. The structure and properties of ternary polysulfone copolymers containing bisphenol fluorene were characterized using gel permeation chromatograph,Fourier-transform infrared spectrometer,and differential scanning calorimeter. The results indicated that the ternary copolymers with a number-average molecular weight higher than 2×104were successfully synthesized at a reaction time of 4 h using N-methyl pyrrolidone as a reaction solvent and potassium carbonate as a salt forming agent. The heat resistance of the copolymers increased gradually with an increase in the content of bisphenol fluorene,and the decomposition temperature of the main chain was higher than 510 ℃. The copolymers presented a glass transition temperature of 254 ℃ at a bisphenol fluorene content of 80 mol%,and their transmittance was 84 % in the visible light range. This can meet the requirements of temperature resistance for aircrafts at high Mach number. This study establishes the basis of application for highly heat-resistant transparent materials.