【摘要】 采用三聚氰胺对聚乙烯醇进行化学改性,制备了聚乙烯醇缩甲醛泡沫材料(PVFM)。探讨了材料的制备并研究了三聚氰胺用量对材料性能的影响。采用红外光谱、热失重分析法和差示扫描量热法对材料进行了测试表征。当三聚氰胺含量相对于聚乙烯醇为7.5%时,材料的拉伸强度为1.96 MPa,比未改性材料提高两倍多;初始热分解温度为322.5℃,比改性前提高了81.6℃。上述结果表明,三聚氰胺的加入明显改善了PVFM的拉伸强度和耐热性。更多还原

【Abstract】 Poly(vinyl formal) cellular plastics(PVFM) modified by melamine was prepared.The preparation of PVFM and the effect of the melamine amount on the properties were investigated.The formation of the modified material was confirmed by Fourier transform infrared spectroscopy(FT-IR).The thermal property was determined by thermogravimetry analysis(TGA),derivative thermogravimetry analysis(DTG) and differential scanning calorimetry(DSC).By adding of 7.5% melamine,the tensile strength is 1.96 MPa,which is 200% higher than that of the material in the absence of melamine.The onset thermal decomposition temperature is 322.5 ℃,which is 81.6 ℃ higher than that of the origin PVFM.Melamine has obvious effect on the tensile strength and the thermal stability of PVFM.更多还原