Alkali-catalyzed methanolysis of polycarbonate. A study on recycling of bisphenol A and dimethyl carbonate
Alkali-catalyzed methanolysis of polycarbonate. A study on recycling of bisphenol A and dimethyl carbonate
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DOI：
10.1016/s0032-3861(97)10298-1
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发表时间：
1998-07-01
期刊：
影响因子：
4.6
通讯作者：
Yamada, E
中科院分区：
文献类型：
--
作者：
Hu, LC;Oku, A;Yamada, E
研究了聚[2，2-双（4-羟基苯基）丙烷碳酸酯]（PC）在甲醇（MeOH）和甲苯或二氧六环混合溶剂中的碱催化甲醇解反应。用催化量的NaOH（每PC的一个酯单元8.5mol%）在60 ℃下在2 ml MeOH中处理PC粒料（1.27g）330分钟仅产生7%双酚A（BPA）。然而，在MeOH（1 ml）和甲苯（1 ml）的混合溶剂中，类似处理70分钟完全解聚PC，得到固体形式的游离双酚A（96%）和溶液形式的碳酸二甲酯（DMC）（100%）。讨论了催化作用的特点以及解聚反应的准一级动力学特征。研究了以双酚A和DMC形式回收PC塑料的反应条件。(C)1998 Elsevier Science Ltd.保留所有权利。
Alkali-catalyzed methanolysis of poly[2,2-bis(4-hydroxyphenyl)propane carbonate] (PC) in a mixed solvent of methanol (MeOH) and toluene or dioxane was studied. Treatment of PC pellets (1.27 g) in 2 mi MeOH with a catalytic amount of NaOH (8.5 mol% per one ester unit of PC) at 60 degrees C for 330 min yielded only 7% bisphenol A (BPA). However, in a mixed solvent of MeOH (1 mi) and toluene (1 mi), the analogous treatment for 70 min completely depolymerized PC to give free bisphenol A (96%) in a solid form and dimethyl carbonate (DMC) (100%) in solution. Characteristics of the catalysis are discussed together with the pseudo-first kinetic feature of the depolymerization. Reaction conditions were investigated for the purpose of recycling PC plastics in the form of bisphenol A and DMC. (C) 1998 Elsevier Science Ltd. Ail rights reserved.