P(MAA-co-BA)对PVC-木粉复合材料性能的影响

为改善亲油性的PVC基体与亲水性木粉之间的相容性,用甲基丙烯酸与丙烯酸丁酯共聚物(P(MAA-co-BA))作为PVC-木粉复合材料的相容剂,研究相容剂的用量及木粉的碱预处理对PVC-木粉复合体系性能的影响,并通过FTIR、接触角、DSC、SEM等手段来表征。FTIR表明:改性后木粉与P(MAA-co-BA)发生了化学键合。接触角分析表明:改性后木粉与PVC界面张力下降;P(MAA-co-BA)有利于木粉与PVC界面的改善和相容性的提高,适量的P(MAA-co-BA)可以提高复合材料的力学性能,过量反而降低力学性能;当P(MAA-co-BA)用量为木粉用量的10%时,复合材料的拉伸强度提高了70.9%,冲击强度提高了64.7%;木粉经碱预处理后再用相容剂处理能进一步提高PVC-木粉复合材料的力学性能。DSC表明:改性后木粉与PVC相容性提高。SEM表明:木粉改性后,既改善了在PVC基体中的分散性,又提高了两者的相容性。

Effects of P(MAA-co-BA) on the properties of PVC-wood flour composite

In order to improve the compatibility between lipophilic PVC matrix and hydrophilic wood flour(WF), the copolymer P(MA-co-BA) of methyl acrylate and butyl acrylate was introduced into PVC-WF composite as compatibilizer. The effects of content of P(MAA-co-BA) and NaOH pretreatment to WF on the mechanical properties of the composite were studied and analyzed by means of FTIR, contact angle, DSC and SEM. The results showed that the interface compatibility of PVC and WF was benefited from P(MAA-co-BA), so the mechanical properties of composite were improved; but excessive P(MAA-co-BA) would reduce the mechanical properties.The tensile strength and impact strength of composite were enhanced by 70.9% and 64.7% respectively, when the content of P(MAA-co-BA) was 10% of wood flour. The mechanical properties of PVC-WF composite could be further enhanced by double treatment of NaOH and P(MAA-co-BA). FTIR spectra confirmed that the modified WF and P(MAA-co-BA) formed a chemical bond; and the contact angle analysis showed that the interfacial tension between modified WF and PVC declined. DSC confirmed that the compatibility of WF and PVC was improved after modification. SEM results also showed that the modification not only improved the dispersion of WF in PVC matrix, but improved the compatibility between WF and PVC.