使用聚甲基丙烯酸甲酯共混物稳定聚氯乙烯：热解气相色谱/质谱研究。
Stabilizing poly(vinyl chloride) using its blends with poly(methyl methacarylate): pyrolysis GC/MS studies.
机构信息
Department of Chemistry, Kuwait University, Faculty of Science, P.O. Box 5969, Safat 13060 Kuwait.
Department of Chemistry, Kuwait University, Faculty of Science, P.O. Box 5969, Safat 13060 Kuwait.
出版信息
J Hazard Mater. 2014 Aug 15;278:584-91. doi: 10.1016/j.jhazmat.2014.06.024. Epub 2014 Jun 21.
Binary blends of poly(vinyl chloride) (PVC) with poly(methyl methacarylate) (PMMA) of various compositions were prepared through solution blending. Thermogravimetric and pyrolysis studies of these blends were carried out and the volatile products were separated and quantitatively analyzed by GC/MS. Harmful pyrolysis products from PVC like HCl and different aromatic hydrocarbons are significantly suppressed in presence of a small amount of PMMA. The stabilization effect on PVC was found to be the most significant with 10 wt.%. PMMA contents in the matrix. Mechanism of the stabilization has been explained by the interaction of micro- and macro-radicals resulting from PMMA with PVC, which stabilize the unzipping of polymer chains by a reversible blocking mechanism and increase the amount of cross-linked residue retained above 500 °C.
通过溶液共混法制备了不同组成的聚氯乙烯（PVC）与聚甲基丙烯酸甲酯（PMMA）的二元共混物。对这些共混物进行了热重和热解研究，并通过 GC/MS 对挥发产物进行了分离和定量分析。在少量 PMMA 的存在下，可显著抑制 PVC 产生有害的热解产物，如 HCl 和不同的芳烃。在基体中含有 10wt.% PMMA 时，对 PVC 的稳定效果最为显著。通过 PMMA 与 PVC 之间产生的微观和宏观自由基的相互作用，解释了稳定作用的机理，这种相互作用通过可逆的阻断机制稳定了聚合物链的解拉链，并增加了超过 500°C 时保留的交联残余物的量。
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