以对苯二酚、对羟基苯甲酸、甲苯二异氰酸酯（2,4-TDI）和二缩三乙二醇等为原料,采用溶液聚合的方法,共缩聚合成具有液晶性的主链型聚氨酯（PLCP）,并采用傅里叶红外光谱（FT-IR）、偏光显微镜（POM）及广角X射线衍射（WAXD）等对其结构进行了表征,研究证实该化合物为向列型液晶。研究了PLCP增韧改性环氧树脂固化体系的力学性能、热性能及断裂面的微观形态结构,结果表明,PLCP质量分数为3%可使材料的冲击强度提高近2倍,热分解温度提高5℃~10℃。
The main-chain liquid-crystalline polyurethane（PLCP） was synthesized by the solvent copolymerization of hydroquinone,para hydroxy benzoic acid,toluenediisocyanate（TDI） and trithylene glycol,then the liquid crystalline properties was characterized by means of Fourier transformed infrared spectroscopy（FT-IR）,polarized optical microscope（POM）,and wide-angle X-ray diffraction（WAXD）.It shows that this compound is nematic liquicl crystal texture.The mechanical properties,thermal properties and microscopic fracture surface morphology of the PLCP toughened epoxy resin were investigated.Experimental results show that the impact strength of composites is two times higher than that of the unmodified system when the content of PLCP loading reaches 3%.In addition,the thermal decomposition temperature is also 5 ℃～10 ℃ higher than that of the unmodified system.
参考文献
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| [2] | 黄增芳,谭松庭,王霞瑜.热致性液晶聚酯的合成及与环氧树脂共混物的性能研究[J].中国塑料,2003(12):32-35. |
| [3] | 赵菲,孙学红,郝立新,刘保成.聚氨酯弹性体的力学性能影响因素研究[J].聚氨酯工业,2001(01):9-12. |
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