为了改善低密度聚乙烯(LDPE)的综合性能,用离子聚合物Surlyn和高密度聚乙烯(HDPE)分别对LDPE进行共混改性,着重研究了改性聚合物的质量分数对LDPE共混体系的微观结构、力学性能以及热性能的影响规律。结果表明,HDPE与LDPE之间具有良好的界面相容性,而Surlyn则呈类球形细小粒子在基体中弥散分布,且其粒径随着Surlyn添加量的增加而增大。虽然Surlyn能全面提升LDPE的力学性能,但其对抗拉强度和弹性模量的提升幅度要远远低于HDPE。示差扫描量热仪(DSC)测试佐证了LDPE与HDPE的部分相容,但Surlyn对LDPE相的熔融和结晶行为影响甚微。Surlyn的引入没有改变LDPE相的热分解过程,但导致了共混体系热分解温度的下降;HDPE则使共混体系的热重曲线(TGA)在高温区右移,共混体系的热分解过程为二阶失重形式。
For the purpose of improving the comprehensive properties of low density polyethylene(LDPE),the ionomer(Surlyn) and high density polyethylene(HDPE) were introduced as modifiers to fabricate blends.The effects of these polymers on the morphologies,mechanical properties and thermal performances of LDPE blends were investigated.Results showed that there was good interfacial compatibility between LDPE and HDPE.However,Surlyn behaved as fine spheric-like particles,dispersing homogenously in LDPE matrix,and the particle sizes became bulky as increased Surlyn.DSC measurements demonstrated the partial compatibility between LDPE and HDPE,whereas there seemed little influences of Surlyn on the melting and crystallization behaviors of LDPE phase in the blends.The incorporation of Surlyn did not alter the thermal decomposition of LDPE,but resulted in the declined temperatures of thermal degradation.On the contrary,the presence of HDPE leaded to the right-shifting of TGA curves at higher temperature zone and the two-stage thermal decomposition of the blends was also observed.
[1] Karami S,Ahmadi Z,Nazockdast H,et al.Thermally stable low-density polyethylene/polyhydroxybutyrate pairs:synergy between organomodified nanoclay and LDPE-g-MAH[J].Journal of Applied Polymer Science,2018,135(9):45922.
[2] Liu Q,Feng R,Hua J,et al.A novel superhydrophobic surface based on low-density polyethylene/ethylene-propylene-diene terpolymer thermoplastic vulcanizate[J].Polymers for Advanced Technologies,2018,29(1):302-309.
[3] Rahmaoui F E Z,Mederic P,Hocine N A,et al.Contribution of the organo-montmorillonite/graphene pair to the rheological and mechanical properties of polyethylene matrix based nanocomposites[J].Applied Clay Science,2017,150:244-251.
[4] Trongsatitkul T,Chaiwong S.In situ fibre-reinforced composite films of poly(lactic acid)/low-density polyethylene blends:effects of composition on morphology,transport and mechanical properties[J].Polymer International,2017,66(11):1456-1462.
[5] Yamak H B,Altan M,Altindal A.Electrical,morphological,thermal and mechanical properties of low density polyethylene/zinc oxide nanocomposites prepared by melt mixing method[J].Optoelectronics and Advanced Materials-Rapid Communications,2016,10(11-12):925-934.
[6] 刘佑习,张有勇.离聚物Surlyn对PBT结构与性能的影响[J].高分子材料科学与工程,1999,15(2):55-58.
[7] 刘佑习,黄永青,赵春花.离聚物Srulyn对PET/PA-6共混物的相容性及形态结构的影响[J].高分子材料科学与工程,1999,15(5):134-137.
[8] 吴唯,吴仁,陈玉洁,等.离聚物Surlyn对聚对苯二甲酸乙二醇酯/聚萘二甲酸乙二醇值共混物结晶性能和力学性能的影响[J].高分子材料科学与工程,2014,30(1):48-52.
[9] 张静旖,丁永红,愈强,等.离聚物Surlyn对PET/PA66共混物性能的影响[J].中国塑料,2011,25(11):22-26.
[10] 吴唯,李宁,张禄冲,等.离聚物对热塑性聚醚酯基吸水膨胀弹性体吸水性能和力学性能的影响[J].高分子材料科学与工程,2016,32(4):68-74.
[11] 姜润喜,梁伯润,戴承渠,等.PET/离聚物共混体系的相容性及形态结构[J].中国纺织大学学报,1995,21(3):46-56.
基金资助
安徽省教育厅科学研究重大项目(KJ2015ZD18);国家自然基金面上项目(51775001);安徽省博士后研究人员科研项目(2014B006)
PDF
(4556KB)
