接枝弹性体增韧吹塑用PET材料的性能

Properties of Grafted Elastomer Toughened PET Materials for Blow Molding

为提高吹塑用聚对苯二甲酸乙二酯(PET)的冲击韧性,选用接枝甲基丙烯酸缩水甘油酯的聚烯烃弹性体(POE-g-GMA)与接枝马来酸酐的聚烯烃弹性体(POE-g-MAH)对吹塑用PET材料进行共混改性,研究两种不同官能团的接枝弹性体添加量对吹塑用PET材料增韧效果及材料其它性能的影响。结果表明,两种接枝弹性体的加入都能提高吹塑用PET材料的韧性,缺口冲击强度分别在POE-g-GMA质量分数为10%与POE-g-MAH质量分数为15%时达到最大,而后随着添加量的增加略有下降,扫描电子显微镜观察共混试样冲击断面微观形貌均表现明显的韧断特征;同时接枝弹性体的加入会导致材料拉伸强度降低,当接枝弹性体质量分数为5%和10%时,POE-g-MAH增韧的材料拉伸强度较低;差示扫描量热测试表明,两种接枝弹性体的添加使材料结晶性能提高,POE-g-GMA与POE-g-MAH质量分数分别为10%与15%时结晶性能最好,熔融温度最高,此时弹性体与PET相容性最好,间接证明了材料缺口冲击强度的变化;熔体流动速率测试表明,随着两种接枝弹性体添加量的增加,材料的流动性呈下降趋势。综合改性材料的力学性能,同时考虑实际生产成本,确认利用POE-g-GMA对吹塑用PET材料的改性效果较好。

To improve the impact toughness of polyethylene terephthalate(PET)for blow molding,a polyolefin elastomer grafted with glycidyl methacrylate(POE-g-GMA)and a polyolefin elastomer grafted with maleic anhydride(POE-g-MAH)were used to blend and modify the PET material for blow molding.The toughening effect of additions of two grafted elastomers with different functional groups on the PET material for blow molding and their impacts on material other properties were studied.The results show that the addition of both types of grafted elastomers can improve the toughness of PET materials for blow molding,the notched impact strength reaches the maximum at 10 wt%POE-g-GMA or 15 wt%POE-g-MAH,respectively,then,with the increase of the addition of the grafted elastomer,it slightly decreases.Scanning electron microscopy observation shows that the micro morphology of the impact section of the blend sample shows obvious ductile fracture characteristics.At the same time,the elastomers decrease the tensile strength,when the mass fraction of the grafted elastomer is 5%and 10%,the tensile strength of POEg-MAH toughened material is lower.Differential scanning calorimetry testing shows that the addition of two types of grafted elastomers improve the crystallization performance of the material,with the best crystallization performance and highest melting temperature at 10 wt%POE-g-GMA or 15 wt%POE-g-MAH.At this time,the compatibility between the elastomer and PET is the best,indirectly proving the change in notched impact strength of the material.The melt flow rate test shows that the flowability of the material shows a decreasing trend with the increase of the addition of two types of grafted elastomers.By comprehensively modifying the mechnical properties of the material and considering the actual production cost,it can be concluded that the modifying effect of PET material for blow molding is better using grafted elastomer POE-g-GMA.