Properties and morphologies of UV‐cured epoxy acrylate blend films containing hyperbranched polyurethane acrylate/hyperbranched polyester
Properties and morphologies of UV‐cured epoxy acrylate blend films containing hyperbranched polyurethane acrylate/hyperbranched polyester
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DOI：
10.1002/polb.20484
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
Gang Xu;Yongbin Zhao;W. Shi
中科院分区：
文献类型：
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作者：
Gang Xu;Yongbin Zhao;W. Shi
研究了含有超支化聚氨酯丙烯酸酯（HUA）/超支化聚酯（HPE）的紫外线固化环氧丙烯酸酯（EB600）共混膜的性能和形貌。 EB600 中添加少量 HUA 可提高拉伸强度和断裂伸长率，而不会损害其储能模量 (E 0 )。与 10% HUA 混合的 EB600 薄膜获得了最高的拉伸强度 31.9 MPa，断裂伸长率约为固化纯 EB600 的两倍。测得其log E 0 (MPa)值为9.48，即固化的EB600膜的log E 0 (MPa)值的约98％。研究了共混物的冲击强度和临界应力强度因子（K1c）。 10 wt% HUA 含量导致 K1c 值是纯 EB600 树脂的 1.75 倍，并且仅添加 5 wt% HPE，EB600/HPE 共混物的冲击强度就从 0.84 kJ m·1 增加到 0.95 kJ m·1。通过薄膜断裂表面的扫描电子显微镜照片证明了 HUA 和 HPE 对 EB600 的增韧作用。此外，对于HPE对EB600的增韧机理，有人认为HPE颗粒作为固化的EB600薄膜中的第二相，在冷拔过程中发生变形，这是由HPE和EB600的弹性模量差异引起的。
The properties and morphologies of UV-cured epoxy acrylate (EB600) blend films containing hyperbranched polyurethane acrylate (HUA)/hyperbranched polyester (HPE) were investigated. A small amount of HUA added to EB600 improved both the tensile strength and elongation at break without damaging its storage modulus (E 0 ). The highest tensile strength of 31.9 MPa and an elongation at break around two times that of cured pure EB600 were obtained for the EB600-based film blended with 10% HUA. Its log E 0 (MPa) value was measured to be 9.48, that is, about 98% of that of the cured EB600 film. The impact strength and critical stress intensity factor (K1c) of the blends were investigated. A 10 wt % HUA content led to a K1c value 1.75 times that of the neat EB600 resin, and the impact strength of the EB600/HPE blends increased from 0.84 to 0.95 kJ m � 1 with only 5 wt % HPE addi- tion. The toughening effects of HUA and HPE on EB600 were demonstrated by scan- ning electron microscopy photographs of the fracture surfaces of films. Moreover, for the toughening mechanism of HPE to EB600, it was suggested that the HPE par- ticles, as a second phase in the cured EB600 film, were deformed in a cold drawing, which was caused by the difference between the elastic moduli of HPE and EB600.