摘要
采用勃姆石(BM)作为阻燃和增强材料,利用熔融共混法制备了BM阻燃和增强改性的聚对苯二甲酸乙二醇酯(PET)/BM复合材料。分别测试了BM用量对于PET复合材料的力学性能、结晶性能、热性能、阻燃性能的影响。结果表明,随着BM用量的增加,PET/BM复合材料的刚性逐渐增加,韧性逐渐降低;PET/BM复合材料的热结晶温度(T_c)和冷结晶温度(T_(cc))分别随着BM用量的增加逐渐升高和降低,且ΔT(T_c-T_(cc))逐渐增加,BM具有异相成核作用,提高了复合材料的结晶速率和相对结晶度(X_c);而复合材料的熔融温度则随着BM用量的增加而逐渐降低;BM对PET具有良好的阻燃作用,BM能够使PET/BM复合材料的残炭量增加,使复合材料的分解温度降低,增加了材料燃烧时的热稳定性。
The PET/boehmite(BM) composites were prepared using BM as a flame-retardant and reinforcement additive, and the effects of BM dosage on the mechanical, crystalline, thermal and flame-retardant properties of the composites were investigated. The experimental results indicated that the rigidity of the composites increased gradually with an increase of BM content, but the toughness tended to decrease gradually. The T_c and T_(cc) of the composites were found to increase and decrease gradually with an increase of BM content, respectively. However, the value of ΔT·(T_c-T_(cc)) shows a gradual increase. BM could act as a nucleation agent to promote the crystallization rate and the relative degree of crystallinity(X_c) of PET domain by heterogeneous nucleation. Nevertheless, the melting temperature of the composites presented a decrease with increasing the content of BM. BM could also generate good flame retardant effect on PET. The incorporation of BM resulted in an increase in char yield and a decrease in decomposition temperature for the composites. As a result, the thermal stability of the composites was improved during combustion. In summary, BM plays an important role in enhancement of mechanical, crystalline and flame-retardant properties for the PET/BM composites.
引文
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