New hybrid latexes from a soybean oil-based waterborne polyurethane and acrylics via emulsion polymerization
New hybrid latexes from a soybean oil-based waterborne polyurethane and acrylics via emulsion polymerization
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DOI：
10.1021/bm700522z
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发表时间：
2007-10-01
影响因子：
6.2
通讯作者：
Larock, Richard C.
中科院分区：
文献类型：
--
作者：
Lu, Yongshang;Larock, Richard C.
以大豆油基水性聚氨酯分散体为原料，以过硫酸钾为引发剂，通过丙烯酸单体（丙烯酸丁酯和甲基丙烯酸甲酯）的乳液聚合，成功合成了一系列新型水性聚氨酯/丙烯酸杂化乳液。采用甲苯2,4-二异氰酸酯与大豆油多元醇（SOL）的多加成反应合成了水性聚氨酯分散体。所制得的混合乳胶含有15-60 wt %的可再生溶胶，通过透射电镜测定，其稳定性非常好，粒径均匀，为125 +/- 20 nm。通过傅里叶变换红外光谱、固态C-13核磁共振光谱、动态力学分析、萃取和力学测试研究了所得到的杂化乳胶膜的结构、热性能和力学性能。在乳液聚合过程中，丙烯酸单体接枝共聚到PU网络上，导致所得到的杂化乳胶的热性能和机械性能显著提高。本研究为利用可再生资源制备高性能环保型杂化乳胶提供了一条新途径。
A series of new waterborne polyurethane (PU)/acrylic hybrid latexes have been successfully synthesized by the emulsion polymerization of acrylic monomers (butyl acrylate and methyl methacrylate) in the presence of a soybean oil-based waterborne PU dispersion using potassium persulfate as an initiator. The waterborne PU dispersion has been synthesized by a polyaddition reaction of toluene 2,4-diisocyanate and a soybean oil-based polyol (SOL). The resulting hybrid latexes, containing 15-60 wt % SOL as a renewable resource, are very stable and exhibit uniform particle sizes of 125 +/- 20 nm as determined by transmittance electronic microscopy. The structure, thermal, and mechanical properties of the resulting hybrid latex films have been investigated by Fourier transform infrared spectroscopy, solid state C-13 NMR spectroscopy, dynamic mechanical analysis, extraction, and mechanical testing. Grafting copolymerization of the acrylic monomers onto the PU network occurs during the emulsion polymerization, leading to a significant increase in the thermal and mechanical properties of the resulting hybrid latexes. This work provides a new way of utilizing renewable resources to prepare environmentally friendly hybrid latexes with high performance for coating applications.