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首页> 外文期刊>International Polymer Processing: The Journal of the Polymer Processing Society >Effect of Prepolymerization Time on Morphology and Properties of Epoxy-modified Bismaleimide Foams
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Effect of Prepolymerization Time on Morphology and Properties of Epoxy-modified Bismaleimide Foams

机译:预聚合时间对环氧改性双马来酰亚胺泡沫形态和性能的影响

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摘要

Epoxy-modified bismaleimide (BMI) foams were prepared through prepolymerization and foaming. Density-adjustable BMI foams with closed-cell structures were produced. The influence of prepolymerization time on bubble growth and morphology, as well as the compressive and heat resistant properties of the foams, were thoroughly investigated. BMI prepolymerization was an effective method for controlling the bubble growth rate, the bubble size and its distribution, and the foam density. As the prepolymerization time increased, the matrix viscosity, the number of cells per unit volume and the foam density increased, whereas, the bubble growth rate and cell size decreased, and the cell size distribution became narrower. The compressive strength and modulus increased with increasing prepolymerization time. The dimensional stability temperatures of the BMI foams were all above 200°C, as determined by their base materials, and were unaffected by prepolymerization time.
机译:通过预聚合和发泡制备环氧改性的双马来酰亚胺(BMI)泡沫。产生了具有闭孔结构的密度可调的BMI泡沫。彻底研究了预聚合时间对气泡生长和形态的影响,以及泡沫的压缩和耐热性能。 BMI预聚合是控制气泡生长速率,气泡大小及其分布以及泡沫密度的有效方法。随着预聚合时间的增加,基体粘度,每单位体积的泡孔数和泡沫密度增加,而气泡生长速率和泡孔尺寸减小,并且泡孔尺寸分布变窄。抗压强度和模量随预聚合时间的增加而增加。 BMI泡沫的尺寸稳定性温度(由其基础材料确定)均高于200°C,并且不受预聚合时间的影响。

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