共混型TPU/LDPE交联体系的制备与性能
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摘要
以热塑性聚氨酯(TPU)及低密度聚乙烯(LDPE)为基体,过氧化二异丙苯(DCP)为交联剂,采用熔融共混技术制备了具有交联结构的TPU/LDPE形状记忆共混物,并对共混物的凝胶含量、力学性能、形状记忆性能进行了研究。结果表明,DCP的加入使共混物的凝胶含量增大、力学性能提高,并在DCP的质量分数为0.3%时,TPU/LDPE共混物的力学性能达到最佳。形状记忆性能研究表明,DCP的加入使TPU/LDPE共混物的形状回复率呈先上升后下降的趋势,并在DCP的质量分数为0.5%时形状回复率达到最大。TPU/LDPE共混物形状固定率的变化趋势与形状回复率基本相反。相比于纯TPU,DCP的加入使TPU/LDPE共混物的形状回复率和形状固定率均有所上升。而且,TPU/LDPE共混物的拉伸应变越低,形状回复率越高。
In this work,a shape memory polymer blend with crosslinked structure with thermoplastic polyurethane( TPU) and low density polyethylene( LDPE) as matrix,and dicumyl peroxide( DCP) as crosslinking agent was prepared by melt blending method. The mechanical properties,gel content and shape memory properties of the obtained blends were investigated. It was found that the gel content and mechanical properties of the blends increased with the addition of DCP, and the mechanical properties of the blends reached the maximum at 0. 3wt% DCP content. Shape memory properties studies showed that the shape recovery rate of TPU/LDPE blends increases first and then decreases with the addition of DCP,and the shape recovery ratio reached the maximum at 0. 474wt%DCP content. The changing trend of the shape fixed rate of the blends is basically contrary to that of the shape recovery rate. Compared with pure TPU,both the shape recovery rate and the shape fixation rate of TPU/LDPE blend increase with the addition of DCP. Moreover,the TPU/LDPE blend shows higher shape recovery ratio at low tensile strain than that at the high tensile strain.
In this work,a shape memory polymer blend with crosslinked structure with thermoplastic polyurethane( TPU) and low density polyethylene( LDPE) as matrix,and dicumyl peroxide( DCP) as crosslinking agent was prepared by melt blending method. The mechanical properties,gel content and shape memory properties of the obtained blends were investigated. It was found that the gel content and mechanical properties of the blends increased with the addition of DCP, and the mechanical properties of the blends reached the maximum at 0. 3wt% DCP content. Shape memory properties studies showed that the shape recovery rate of TPU/LDPE blends increases first and then decreases with the addition of DCP,and the shape recovery ratio reached the maximum at 0. 474wt%DCP content. The changing trend of the shape fixed rate of the blends is basically contrary to that of the shape recovery rate. Compared with pure TPU,both the shape recovery rate and the shape fixation rate of TPU/LDPE blend increase with the addition of DCP. Moreover,the TPU/LDPE blend shows higher shape recovery ratio at low tensile strain than that at the high tensile strain.
引文
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[2]BEH M,RAZZAQ M Y,LENDLEIN A.Multifunctional shape memory polymers[J].Adv Mater,2010,22(31):3388-3392.
[3]QIAN Z,QI H J,XIE T.Recent progress in shape memory polymer:New behavior,enabling materials,and mechanistic understanding[J].Prog Polym Sci,2015,49-50:79-12.
[4]朱文超,崔海坡,郭丹一.形状记忆聚合物特性及在生物医学领域应用中的优势[J].中国组织工程研究,2014,18(47):7677-7682.
[5]赵建宝,吴雪莲,戈晓岚,等.形状记忆聚合物及其应用前景[J].材料导报,2015,29(21):75-80.
[6]刘婷婷,朱光明,魏堃,等.形状记忆聚合物复合材料的研究进展[J].高分子材料科学与工程,2013,29(11):183-186.
[7]江凤丹.聚氨酯/碳纳米管纳米复合材料的制备及结构与性能研究[D].北京:北京化工大学,2009.
[8]曹新鑫,王优,李启强,等.热塑性聚氨酯弹性体共混改性研究进展[J].化工新型材料,2015(4):70-73.
[9]蔺海兰,朱庆兰,卞军,等.共混型石墨烯-nano Si O2/TPU复合材料的制备与性能[J].复合材料学报,2016,33(7):1382-1389.
[10]朱荟,董擎之.Ti O2-Si O2纳米复合颗粒改性形状记忆聚氨酯[J].华东理工大学学报(自然科学版),2008,34(2):229-234.
[11]周醒,夏元梦,蔺海兰,等.Nano-Si O2功能化改性石墨烯/热塑性聚氨酯复合材料的制备与性能[J].复合材料学报,2016,34(3):1-9.
[12]谭晓莉.高密度聚乙烯/热塑性聚氨酯的共混及其γ-辐照效应[D].郑州:郑州大学,2007.
[13]邸亚丽,亢茂青,赵雨花.马来酸酐接枝聚丙烯对聚氨酯/聚丙烯共混物的形态和力学性能的影响[J].高分子材料科学与工程,2006,22(3):109-112.
[14]YUAN H.Study of comatibilized ultra-high-molecular-weight polyethylene and polyurethane blend[J].J Appl Polym Sci,2001,81(13):3290-3295.
[15]燕晓飞,邱桂学.热塑性聚氨酯与聚烯烃共混改性研究进展[J].塑料科技,2008,36(4):94-98.
[16]HAO Y,PING H.Study of a compatibilized ultra-high-molecular-weight polyethylene and polyurethane blend[J].J Appl Polym Sci,2001,81(13):3290-3295.
[17]刘新民,许春霞,葛涛,等.过氧化物交联聚乙烯的力学性能研究[J].现代塑料加工应用,2003,15(6):14-17.
[18]GULMINE J V,AKCELRUD L.Correlations between the processing variables and morphology of crosslinked polyethylene[J].J Appl Polym Sci,2004,94(1):222-230.
[19]KHONAKDAR H A,MORSHEDIAN J,WAGENKNECHT U.An investigation of chemical crosslinking effect on properties of high-density polyethylene[J].Polymer,2003,44(15):4301-4309.
[20]刘善秋,公维光,郑柏存.过氧化物交联低密度聚乙烯的结构与性能关系研究[J].塑料工业,2013,41(5):33-37.
[21]李朝,强涛,陈卫星,等.交联聚乙烯/纳米碳酸钙纳米复合材料的形状记忆性能研究[J].塑料工业,2013,41(11):119-123.