高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (6): 1965.doi: 10.7503/cjcu20200850

• 高分子化学 • 上一篇    下一篇

具有广谱紫外屏蔽性能的三元共聚物微球的制备

刘晓锦, 李婷, 汪洋, 东为富()   

  1. 江南大学合成与生物胶体教育部重点实验室, 化学与材料工程学院, 无锡 214122
  • 收稿日期:2020-12-07 出版日期:2021-06-10 发布日期:2021-06-08
  • 通讯作者: 东为富 E-mail:wfdong@jiangnan.edu.cn
  • 基金资助:
    国家自然科学基金(22005122)

Preparation of Terpolymer Microspheres with Broad Band UV-blocking Performance

LIU Xiaojin, LI Ting, WANG Yang, DONG Weifu()   

  1. Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China
  • Received:2020-12-07 Online:2021-06-10 Published:2021-06-08
  • Contact: DONG Weifu E-mail:wfdong@jiangnan.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22005122)

摘要:

以醋酸乙烯酯(VA)、 马来酸酐(MA)和商品化的紫外吸收剂2-{2-羟基-5-[2-(甲基丙烯酰氧)乙基]苯基}-2H-苯并三唑(NB)为单体, 偶氮二异丁腈(AIBN)为引发剂, 通过自稳定沉淀聚合法(2SP)制备了具有广谱紫外屏蔽性能的单分散三元共聚物微球(PVMN); 研究了溶剂、 单体配比、 引发剂用量、 单体浓度、 反应温度和反应时间对共聚物微球形态和性能的影响. 研究结果表明, 体积比为7∶3的苯甲酸乙酯/正庚烷混合溶剂是2SP法合成单分散PVMN微球的理想溶剂. 随着单体配比中紫外吸收单体NB比例的增加, 引发剂用量、 单体浓度、 反应温度的提高和反应时间的延长, 微球的粒径随之增大, 进而改变了微球的紫外屏蔽性能. 本文制备的微球的粒径范围为(249±19)~(1434±213) nm, 优化得到的PVMN微球可屏蔽约90%的紫外光. 该策略还可扩展到其它可用作紫外吸收剂的乙烯基单体, 是一种制备稳定高分子紫外屏蔽剂的通用方法.

关键词: 自稳定沉淀聚合, 紫外屏蔽, 三元共聚物, 微球

Abstract:

Monodispersed ternary polymer microspheres with broadband UV-blocking performance were successfully prepared through the self-stabilized precipitation polymerization(2SP) of vinyl acetate(VA), maleic anhydride(MA) and a commercial vinyl UV absorber, 2-{2-Hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl}-2H-benzotriazole(NB), using 2,2'-azobisisob-utyronitrile(AIBN) as an initiator. The effects of solvent, monomer feed ratio, initiator concentration, monomer concentration, reaction temperature and reaction time on the morphology, particle diameters, size distribution and UV-blocking performance of the resultant polymeric microspheres were investigated systematically. The structure, appearance and UV-blocking property were studied by Fourier transform infrared(FTIR) spectroscopy, scanning electron microscopy(SEM), laser diffraction particle size analyser and UV transmittance spectroscopy. The experimental results indicated that the mixed solvent of ethyl benzoate and n-heptane with 7∶3 volume ratio is the optimal solvent for preparation of monodispersed poly(VA-co-MA-co-NB)(PVMN) microspheres via 2SP process. The diameters and UV-blocking performance of the polymeric microspheres can be easily controlled by facile change of reaction conditions. With the increase of ratio of UV absorber NB, initiator concentration, monomer concentration and reaction temperature, the size of the polymeric microspheres increased while still keeping well dispersity. The dry diameter of PVMN microspheres can be ranged from (249±19) nm to (1434±213) nm, and optical PVMN microspheres could surprisingly block about 90% UV radiation. In addition, the established preparative strategy can be potentially extended to other UV-absorbant vinylic monomer and is a versatile method for fabricating stable polymer UV absorber.

Key words: Self-stabilized precipitation polymerization, UV-blocking, Ternary copolymer, Microsphere

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