Page 65 - 《精细化工》2019年第11期
P. 65
第 36 卷第 11 期 精 细 化 工 Vol.36, No.11
2019 年 11 月 FINE CHEMICALS Nov. 2019
功能材料
分子链剪切技术制备超低分子量聚氧化乙烯
徐玄之 1,2,3 ,刘婷婷 1,2,3 ,柴延军 1,2,3 ,孔 猛 1,2,3 ,罗 勇 1,2,3*
(1. 聚烯烃催化技术与高性能材料国家重点实验室,上海 200062;2. 上海市聚烯烃催化技术重点实验室,
上海 200062;3. 上海化工研究院有限公司,上海 200062)
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摘要:采用紫外光对黏均分子量为 1.5×10 的聚氧化乙烯(PEO)进行了分子链剪切,得到了黏均分子量低于
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2.0×10 的超低分子量 PEO。考察了紫外光波长、功率、光源距离和反应温、湿度等因素对 PEO 紫外剪切速率
的影响,并对制备得到的不同低分子量 PEO 进行了结构分析和性能测试。结果表明:在紫外波长为 185 nm、功
率为 75 W、光源距离为 5 cm、环境温度为 35 ℃、相对湿度为 20%的较优反应条件下,反应 2、3、4 和 5 h 可
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分别制备黏均分子量为 2.0×10 、1.1×10 、7.0×10 和 4.0×10 的超低分子量 PEO。随着降解时间的延长,PEO
的分子量分布系数减小。PEO 在紫外剪切过程中结构未发生明显改变,仅有少量甲酸酯生成。随着分子量的减
小,PEO 的熔点降低,结晶度增加。
关键词:聚氧化乙烯;分子链剪切;超低分子量;紫外光;功能材料
中图分类号:TQ317 文献标识码:A 文章编号:1003-5214 (2019) 11-2213-07
Preparation of Ultra-low Molecular Weight Polyethylene Oxide
by Molecular Chain Shearing Technology
XU Xuan-zhi 1,2,3 , LIU Ting-ting 1,2,3 , CHAI Yan-jun 1,2,3 , KONG Meng 1,2,3 , LUO Yong 1,2,3*
(1. Shanghai Key Laboratory of Catalysis Technology for Polyolefins, Shanghai 200062, China; 2. State Key
Laboratory of Polyolefins and Catalysis, Shanghai 200062, China; 3. Shanghai Research Institute of Chemical Industry,
Shanghai 200062, China)
Abstract: The molecular chain shear of polyethylene oxide (PEO) with a molecular weight of 1.5×10 6
was carried out under ultraviolet light irradiation, and the PEO samples with ultra-low viscosity average
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molecular weight of less than 2.0×10 were obtained. The effects of ultraviolet wavelength, power, source
distance, environmental temperature and humidity on the ultraviolet shear rate of PEO were studied. The
structure and properties of PEO with different low molecular weight were characterized. The results showed
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that ultra-low molecular weight PEO samples with viscous average molecular weight of 2.0×10 , 1.1×10 ,
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7.0×10 and 4.0×10 were obtained in the test facility under the optimum reaction conditions of UV
wavelength 185 nm, power 75 W, light source distance 5 cm, reaction temperature 35 ℃ and relative
humidity 20%. With the prolongation of shearing time, the molecular weight distribution coefficient of PEO
decreased. The structure of PEO did not change significantly during ultraviolet shearing, only small amount
of formate formed. The melting point of PEO decreased and the crystallinity increased with the decrease of
molecular weight.
Key words: polyethylene oxide; molecular chain shearing; ultralow molecular weight; ultraviolet;
functional materials
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聚氧化乙烯(PEO)是由环氧乙烷开环聚合而 分子量(M Ƞ )可在 2.0×10 ~ 8.0×10 之间变化,不
[1]
成的线性、非离子型高分子化合物 。PEO 的黏均 同黏均分子量的产品具有不同的优异性能,广泛应
收稿日期:2019-03-17; 定用日期:2019-04-22; DOI: 10.13550/j.jxhg.20190203
基金项目:上海市科委青年科技启明星项目(19QB1402600)
作者简介:徐玄之(1992—),女,硕士生,E-mail:xuxuanzhi_hg@163.com。联系人:罗 勇(1974—),男,教授级高工,
E-mail:luoyongno.1@163.com。