拉伸对PA6/PET/AX8900薄膜直线易撕裂性能的影响

Effect of Stretching on Linear Tear Property of PA6/PET/AX8900 Film

以PA6为基体,引入PET相,制备五种不同配比的PA6/PET/AX8900复合材料薄膜和双向拉伸薄膜,采用SEM、DMA、DSC等研究了双向拉伸前后PA6/PET/AX8900复合材料薄膜的微观形貌、热力学和结晶行为,探讨了复合材料薄膜的直线撕裂性能、力学性能、阻隔性能和光学性能,同时研究相容剂EAG(AX8900)对PA6与PET相容性的影响。研究结果表明,添加3%AX8900对PA6/PET复合材料薄膜有明显的增容效果,PET在PA6基体中分散良好;当PET添加量从0%增加到35%时,PA6/PET/AX8900复合材料薄膜熔点降低,与此同时,由于PET中刚性苯环的存在,结晶温度从187.01℃下降到183.47℃。力学性能测试显示,当PET添加量为25%时,PA6/PET/AX8900薄膜拉伸强度相较于纯PA6膜提升25%,断裂伸长率基本不变。当拉伸比为3×1时,PET添加量为25%的PA6/PET/AX8900双向拉伸薄膜的拉伸强度较纯PA6提高了88%。直线易撕裂测试结果表明,当PET添加量从0%增加到25%时,复合材料薄膜的撕裂偏差从100%降低到46%。PET添加量为25%的PA6/PET/AX8900复合材料薄膜经过双向拉伸后,撕裂偏差相较于未拉伸前的PA6/PET/AX8900复合材料薄膜显著降低,当拉伸比为3×1时,PA6/PET/AX8900共混膜的撕裂偏差为3.2%;此外,当PET的添加量为25%时,PA6/PET/AX8900复合材料薄膜的阻隔性能和雾度都得到改善。

Using PA6 as the matrix and introducing the PET phase to prepare five different blending ratios of PA6/PET/AX8900 blended films and biaxially oriented films.Morphology,thermodynamics and crystallization behavior of the PA6/PET/AX8900 blended films before and after biaxial stretching were studied by SEM,DMA,DSC,etc.The linear tearing performance,mechanical properties,barrier properties and optical properties of the blend film were discussed.At the same time,the influence of the compatibilizer EAG(AX8900) on the compatibility of PA6 and PET was studied.The research results show that the addition of 3wt% AX8900 has a significant compatibilizing effect on the PA6/PET blend film,and the PET is well dispersed in the PA6 matrix;when the amount of PET added was increased from 0wt% to 35wt%,the melting point of the PA6/PET/AX8900 blend film decreased.At the same time,due to the presence of rigid benzene rings in PET,the crystallization temperature dropped from 187.01 ℃ to 183.47 ℃.The mechanical performance test showed that when the amount of PET added was 25wt%,the tensile strength of the PA6/PET/AX8900 film was increased by 25% compared with the pure PA6 film,and the elongation at break was basically unchanged.When the stretch ratio was 3×1,the tensile strength of the PA6/PET/AX8900 biaxially oriented film with a PET addition of 25wt% was 88% higher than that of pure PA6.The results of the straight-line tear test showed that when the amount of PET added was increased from 0wt% to 25wt%,the tear deviation of the blend film decreased from 100% to 46%.After the PA6/PET/AX8900 blend film with a PET content of 25wt% was biaxially stretched,the tear deviation was significantly lower than that of the unstretched PA6/PET/AX8900 blend film.When the stretch ratio was 3×1,the PA6/PET/AX8900 blend film had a tear deviation of 3.2%.In addition,when the added amount of PET was 25wt%,the barrier properties and haze of the PA6/PET/AX8900 blend film were improved.