Effects Of Solvent Composition And Polymer Concentration On Poly (Ethylene Terephthalate) Degradation In Phenol: 1,2-Dichlorobenzene Blended Solvent

Global Journal of Environmental Sciences Pub Date : 2005-02-08 DOI:10.4314/GJES.V3I1.2430

J. Otaigbe, Hc Nwokonkwo, C. Snr

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引用次数: 1

Abstract

Poly (ethylene terephthalate) was evaluated for its acid number, ash content and melting temperature, and were found to be 2m mol COOH/Kg, 0.0037% and 260-2630C respectively. Its solution in Phenol: 1,2-dichlorobenzene solvent mixtures of 35%: 65%, 50%: 50%, 65%: 35% by weight was degraded at 143± 2oC. The effects of solvent composition and polymer concentration on poly (ethylene terephthalate) degradation in solution were investigated by dilute solution viscometric method using 0.460, 0.500 and 0.540 g/dl polymer concentrations, respectively. Results indicate that at 35%: 65%: by weight Phenol: 1,2-dichlorobenzene solvent composition, intrinsic viscosity–degradation time profile was linear with slopes of 2.50x10 -4 , 3.10 X 10 -4 and 3.33 X 10 -4 and dlg -1 min -1 for polymer concentrations of 0.460, 0.500 and 0.540 g/dl respectively. This showed that the rate of degradation increased with increase in polymer concentration. Similar results were obtained for 50% Phenol: 50% 1,2-dichlorobenzene solvent mixture but with an initial high rate of degradation within the first 60 minutes of degradation time. At 65% phenol concentration, a decrease in the rate of degradation as the polymer concentration increased was observed as evidenced by a decrease in the slopes of the linear plots from 3.06x10 -4 dlg -1 min -1 to 2.63x10 -4 dlg -1 min -1 for a decrease in polymer concentration from 0.500 g/dl to 0.460g/dl. KEY WORDS: Poly (ethylene terephthalate), Degradation, Solution Viscometry. Global Journal of Environmental Sciences Vol.3(1&2) 2004: 59-64

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溶剂组成和聚合物浓度对苯酚- 1,2-二氯苯混合溶剂降解聚对苯二甲酸乙酯的影响

对聚对苯二甲酸乙酯的酸值、灰分含量和熔融温度进行了评价，分别为2m mol COOH/Kg、0.0037%和260-2630℃。其溶液在苯酚:1,2-二氯苯35%:65%、50%:50%、65%:35%的重量溶剂混合物中，在143±20℃下降解。采用稀溶液粘度法研究了溶剂组成和聚合物浓度对溶液中聚对苯二甲酸乙酯降解的影响，聚合物浓度分别为0.460、0.500和0.540 g/dl。结果表明，当聚合物浓度分别为0.460、0.500和0.540 g/dl时，苯酚:1,2-二氯苯的溶剂比例为35%:65%时，特性粘度-降解时间曲线呈线性关系，斜率分别为2.50 × 10 -4、3.10 × 10 -4和3.33 × 10 -4，斜率为dlg -1 min -1。这表明降解速率随聚合物浓度的增加而增加。50%苯酚:50% 1,2-二氯苯溶剂混合物也得到了类似的结果，但在降解时间的前60分钟内具有较高的初始降解率。当苯酚浓度为65%时，随着聚合物浓度的增加，降解率也随之下降。当聚合物浓度从0.500 g/dl下降到0.460g/dl时，线性曲线的斜率从3.06x10 -4 dlg -1 min -1下降到2.63x10 -4 dlg -1 min -1。关键词:聚对苯二甲酸乙酯，降解，溶液粘度测定环境科学，Vol.3(1&2) 2004: 59-64

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Global Journal of Environmental Sciences

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