Page 65 - 《精细化工》2019年第11期
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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。
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