Overmolded hybrid thermoset-thermoplastic structures: Experimental study on the bonding strength of co-curing thermoplastic film onto thermoset composite
Overmolded hybrid thermoset-thermoplastic structures: Experimental study on the bonding strength of co-curing thermoplastic film onto thermoset composite
复制标题
包覆成型混合热固性-热塑性结构：共固化热塑性薄膜与热固性复合材料粘合强度的实验研究
DOI：
10.1002/app.53488
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发表时间：
2022-12-01
影响因子：
3
通讯作者：
Zhai, Zhanyu
中科院分区：
文献类型：
--
作者：
Miao, Tianyu;Ding, Yudong;Zhai, Zhanyu
在本研究中，提出了一种通过共固化技术和注塑包覆成型技术来生产混合热固性-热塑性结构的创新方法。为了使热固性复合材料可粘合，首先在热固性复合材料的表面上共固化热塑性薄膜。选择五种不同类型的热塑性薄膜与热固性复合材料共固化。热塑性薄膜和热固性复合材料之间的粘合强度用搭接剪切强度来评价。结果表明，对热塑性薄膜进行等离子体处理可以促进界面上的极性基团，这对提高润湿性具有积极作用，并且可以将共固化结构的粘合强度提高高达69.7%。同时，由于机械互锁，增加热塑性薄膜的表面粗糙度还可以将粘合强度提高162.9%。特别是，由于茂金属聚丙烯的熔融温度较低，界面区域的一些纤维束被熔融的茂金属聚丙烯浸渍，导致所得共固化结构的强粘合强度增加了266.2%。基于这些结果，聚酰胺 6 薄膜被选为共固化结构的最佳热塑性边界。最后，通过在共固化结构上注射熔融聚酰胺 6 来制造混合热固性热塑性塑料，其平均搭接剪切强度高达 14.9 MPa 左右。
In the present study, an innovative approach to produce hybrid thermoset-thermoplastic structure by means of co-curing technique together with injection overmolding technique is proposed. To make thermoset composite bondable, a thermoplastic film was firstly co-cured on the surface of thermoset composite. Five different types of thermoplastic film were chosen to co-cure with thermoset composite. The bonding strength between thermoplastic film and thermoset composite was evaluated with lap shear strength. The results show that plasma treatment on thermoplastic film can promote polar groups at interface, which has positive effect on increasing wettability and can increase bonding strength by up to 69.7% of co-cured structure. Meanwhile, increasing the surface roughness of thermoplastic film can also increase bonding strength by 162.9% because of mechanical interlock. Especially, because of low melting temperature of metallocene polypropylene, some fiber bundles in the interface zone were impregnated with molten metallocene polypropylene, resulting in strong bonding strength increased by 266.2% of the resultant co-cured structure. Based on these results, polyamide 6 film was selected as the best thermoplastic boundary for co-cured structure. Finally, hybrid thermoset-thermoplastic was fabricated by injection overmolding of molten polyamide 6 on co-cured structure, which has high average lap shear strength of around 14.9 MPa.