为了研究聚乙烯材料的空间电荷特性及力学性能,采用熔融法制备乙烯咔唑(VK)接枝聚乙烯(VK-g-LDPE),并通过电声脉冲法、差热扫描量热法和拉伸试验对VK-g-LDPE的空间电荷分布、结晶度和拉伸性能进行了测试.结果表明,随着接枝率的增加,对VK-g-LDPE内部空间电荷的抑制效果呈现先增强后减弱的趋势;当接枝率为12.45％时,对MK-g-LDPE材料空间电荷的抑制作用最好,试样的电荷密度最大值仅为0.31 C/m3,比聚乙烯降低了95.87％;随着接枝率的增加,VK-g-LDPE的结晶度呈下降趋势;随着接枝率的增加,VK-g-LDPE的拉伸强度呈现先增大后降低的趋势,且当接枝率为13.02％时达到最大值14.2 N/mm2;随着接枝率的增加,VK-g-LDPE的断裂伸长率和弹性模量呈现下降的趋势.
In order to study the space charge and mechanical properties of the polyethylene-based materials,vinyl carbazole (VK) grafted polyethylene (VK-g-LDPE) were prepared by melting method.The space charge distribution,crystallinity and mechanical properties of the vinyl carbazole grafted polyethylene were investigated through pulsed electro-acoustic (PEA),differential thermal scanning calorimetry (DSC) and tensile experiments.The results show that with increase of the grafting degree (GD),the inhibition effect on the internal space charge of VK-g-LDPE firstly increases and then decreases.Moreover,when the GD is 12.45％,the inhibition effect on the internal space charge of VK-g-LDPE is the best,the maximum charge density is 0.31 C/m3,which is 95.87％ lower than that of pure LDPE;with increase of the grafting yield,the crystallinity of VK-g-LDPE decreases,and the tensile strength of VK-g-LDPE firstly increases and then decreaseds the maximum tensile strength is 14.2 N/mm2 when GD is 13.02％;the elongation at break and elastic modulus of VK-g-LDPE show a decreasing trend with increase of the GD.
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