可瓷化交联乙烯-醋酸乙烯共聚物复合材料的制备与性能
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南京工业大学 材料科学与工程学院,江苏 南京 210009

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国家自然科学基金面上项目(22175088);江苏高校优势学科建设工程资助项目(PAPD)


Preparation and Properties of Ceramifiable Ethylene-Vinyl Acetate Copolymer Composites with Three Dimensional Cross-Linking Structures
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    摘要:

    采用过氧化二异丙基苯(BIPB)作为交联剂对乙烯-醋酸乙烯共聚物(EVA)进行交联改性。红外光谱和凝胶质量分数测试证明了改性后的EVA形成了一种交联结构,其凝胶含量约为99.3%。并进一步研究了EVA/硅酸盐玻璃粉(SGF)/聚磷酸铵(APP)复合体系下的基体交联程度,结果为98.8%,表明填料的添加对基体的交联反应几乎没有影响。动态流变分析表明交联改性EVA复合材料比未改性的具有更高的剪切黏度和熔体强度。热重分析表明交联改性能够提升复合材料的热稳定性,在质量损失为5%时的温度为329 ℃,高于未改性的311 ℃。耐火性能测试表明交联改性复合材料的烧蚀残余物弯曲强度随烧蚀温度的升高而增大,在1000 ℃时的弯曲强度是未改性样品的1.94倍,并且在烧蚀过程中能够很好的支撑其残渣重量,扫描电镜图片也显示其陶瓷体的结构更致密,表面裂纹相对更少。因此,基体的交联改性改善了材料的耐火性能。

    Abstract:

    Ceramifiable ethylene-vinyl acetate copolymer(EVA)composite with three dimensional cross-linking structures was prepared by using bis(tertbutylperoxy) diisopropyl benzene (BIPB) as cross-linking agent. The FT-IR spectra and the value of gel content as 99.3% prove that the cross-linking structures are formed. Then the degree of cross-linking in the EVA matrix with silicate glass frits (SGF) and ammonium polyphosphate (APP) as additives was studied. The value of gel content as 98.8% suggests that the SGF and APP show no effect on the cross-linking reaction. Dynamic rheological analysis shows that the cross-linked EVA composite has higher shear viscosity and melt strength than unmodified EVA composite. Thermogravimetric analysis (TGA) results indicate that the cross-linking modification can improve the thermal stability of the composite. The cross-linked EVA composite exhibited a higher T5% degradation temperature (T5% = 329 ℃) than unmodified EVA composite (T5% = 311 ℃). The fire resistance tests show that the flexural strength of ceramics residues of the cross-linked EVA composite increases with the increase of ablation temperature, the flexural strength is 1.94 times that of the unmodified samples at 1000 ℃, and can well support the weight of the residues in the ablation process,which is also shown by SEM analysis that the surface structures of the residues of the cross-linked EVA composite have a more continuous and more compact structure at corresponding temperatures than unmodified samples. Therefore, the cross-linking structures in the matrix improve the fire resistance of the material.

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  • 收稿日期:2022-03-24
  • 最后修改日期:2022-04-26
  • 录用日期:2022-06-20
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