Diamine-based benzoxazine/bismaleimide blends and their glass clothreinforced laminates

doi:10.11949/j.issn.0438-1157.20150385

Abstract

Abstract:

Blends of 3,3'-phenylmethanebis(3,4-dihydro-2H-1,3-benzoxazine)(BZ) and 4,4'-bismaleimi-dodiphenyl methane (BMI) were prepared via solvent method. The curing behaviors of the BZ/BMI blends were studied by differential scanning calorimetry (DSC), FTIR, and gelation time test. The thermal properties and mechanical properties of the BZ/BMI cured blends were studied by dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA) and electromechanical universal testing machine. The results showed that the addition reaction between phenolic hydroxyl group and the double bond occurred except for the homopolymerizations of BZ and BMI. The curing temperature and the gelation time of the blends were lowered. The cured BZ/BMI blends exhibited excellent thermal properties. When BMI content was 80%, the cured BZ/BMI blends exhibited higher glass transition temperatures (T_g) than BZ and BMI homopolymers, which reached up to 289℃. The 5% and 10% weight loss temperatures (T_d5 and T_d10) reached up to 387℃ and 422℃, respectively. Meanwhile, when BMI content was 60%, shear strength of the cured BZ/BMI blends achieved to 12.44 MPa. Furthermore, glass cloth (GF) reinforced laminates based on the cured BZ/BMI blends were prepared, and their mechanical properties and morphologies were investigated. The results showed that the enhanced mechanical properties were mainly due to the strong interfacial adhesions between GF and matrices, which was confirmed by SEM observations. When BMI content was 40%, their tensile strength, flexural strength and impact strength reached up to 394 MPa, 490 MPa and 160 kJ·m^-2, respectively.

Key words: benzoxazine, bismaleimide, cured resin, composite, thermal property, mechanical property

摘要：

苯并噁嗪(BZ)和双马来酰亚胺(BMI)按照不同的配比进行共混固化。用FTIR、DSC、凝胶化时间、DMA、TGA、万能电子拉力机分别研究了BZ/BMI共混体系的固化行为以及BZ/BMI固化树脂的热性能和剪切强度等。结果表明BZ和BMI除了发生均聚反应,还发生苯并噁嗪开环生成的酚羟基和双马来酰亚胺的双键生成醚键的反应。BZ和BMI共混后,固化温度比各自的固化温度都低。BMI的加入提高了共混树脂的热性能,BZ/BMI固化树脂的T_g达289℃,T_d5达387℃,T_d10达422℃,800℃的残炭率达55.3%。另外,BMI的加入提高了BZ/BMI固化树脂的剪切强度,当BMI的含量为60％时,BZ/BMI固化树脂的剪切强度为12.44 MPa。进一步,制备了玻璃布增强的BZ/BMI层压板,并对其力学性能和断面形貌进行了研究。结果表明,当BMI用量为40%时,BZ/BMI层压板的拉伸强度、弯曲强度、冲击强度分别达394 MPa、490 MPa、160 kJ·m^-2。

关键词: 苯并噁嗪, 双马来酰亚胺, 固化树脂, 复合材料, 热性能, 力学性能

CLC Number:

O631

ZHANG Jing. Diamine-based benzoxazine/bismaleimide blends and their glass clothreinforced laminates[J]. CIESC Journal, 2015, 66(10): 4288-4294.

张静. 二元胺型苯并噁嗪/双马来酰亚胺共混树脂及其玻璃布增强的层压板[J]. 化工学报, 2015, 66(10): 4288-4294.

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