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乙二醇降解聚2,6-萘二甲酸乙二醇酯 预览

Degradation of poly -ethylene 2 , 6 -naphthalene dicarboxylate
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摘要 采用乙二醇对聚2,6-萘二甲酸乙二醇酯(PEN)进行降解,表征了醇解产物,探讨了醇解原理。结果表明:醇解后PEN中的酯键断裂,PEN分子内的蟄合羟基变成2,6-萘二甲酸乙二醇酯(BHEN)上分子间缔合羟基和游离羟基;醇解后产物的O与C的原子比由醇解前的0.28增至0.38,醇解产物中C=O和C-O两种O结构的质量比为1∶2.18,C-C、C-O和O-C=O三种C结构的质量比为5.38∶2.22∶1,产物的平均分子量降为200左右;醇解产物主要为BHEN及其低聚物,BHEN单体纯度在90%以上,收率为25.95%。该醇解反应是酯基断裂又聚合,PEN长链变短的过程. Ethylene glycol was used for degradation of poly-ethylene 2 , 6-naphthalate dicarboxylate ( PEN ). The alcoholysis products were characterized and the alcoholysis mechanism was discussed. The results showed that : The ester bond in PEN was broken after alcoholysis , caused the stellate hydroxyl groups in PEN modules converting to the intermolecular associative hydroxyl groups and the free hydroxyl groups on the monomer bis ( hydroxyethyl ) naphthalate ( BHEN );After alcoholysis , the ratio of O and C atoms in the alcoholysis product increased from 0.28 to 0.38 , the mass ratio of two O atom content ( C = O and CO ) was 1 ∶ 2.18 , the mass ratio of three C atom content ( CC , CO and O-C = O ) was 5.38 ∶ 2.22 ∶ 1 , and the average molecular weight of the products was about 200;The main alcoholysis products were BHEN and oligomers , and the purity of the monomer BHEN was above 90 % with 25.95 % of yield. The essence of the alcoholysis reaction was a continuous fracture and polymerization process of ester groups , with the shortening of PEN chain.
作者 李琛 游素珍 LI Chen;YOU Suzhen(Collede School of Engineering and Technology,Northeast Forestry University,Harbin 150040,China)
出处 《化工环保》 CAS CSCD 北大核心 2019年第1期50-54,共5页 Environmental Protection of Chemical Industry
基金 中央高校基本科研业务费专项资金项目(2572018BL07)。
关键词 聚2 6-萘二甲酸乙二醇酯 2 6-萘二甲酸乙二醇酯 乙二醇 醇降解 poly -ethylene 2 , 6 -naphthalene dicarboxylate ( PEN ) bis ( hydroxyethyl ) naphthalate ( BHEN ) ethylene glycol alcoholysis degradation
作者简介 李琛(1979—),女,黑龙江省哈尔滨市人,博士,副教授,电话13101618902,电邮lichen_nefu@163.com
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