乙烯-1-丁烯共聚物为橡胶相的抗冲共聚聚丙烯的结构
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摘要
通过核磁共振波谱仪、凝胶渗透色谱仪、差示扫描量热仪、扫描电子显微镜等对乙烯-1-丁烯共聚物为橡胶相的抗冲共聚聚丙烯的结构进行了分析,并测试了其模塑收缩率及耐应力发白性能。结果表明:乙烯-1-丁烯共聚物可溶物的相对分子质量较低时,所制抗冲共聚聚丙烯在注塑过程中易受到剪切应力作用而沿熔体流动方向形成柱状取向结构,此橡胶相取向结构赋予抗冲共聚聚丙烯低模塑收缩率和良好的耐应力发白性能;乙烯-1-丁烯共聚物可溶物的相对分子质量较高时,所制抗冲共聚聚丙烯在注塑过程中则呈现典型的"海-岛"状橡胶形态,因而表现出较高的模塑收缩率和较差的耐应力发白性能。
The structure of impact polypropylene(IPP) with ethylene/1-butenen copolymer(EBC) as rubber phase were analyzed by nuclear magnetic resonance spectrometer,gel permeation chromatograph,differential scanning calorimeter,and scanning electron microscope. The mold shrinkage and stress whitening properties of the copolymer were measured. The results show that when the molecular weight of EBC soluble is low,the IPP prepared is under the action of shear stress during the injection molding process and forms a columnar oriented structure in the melt flow direction. This rubber phase oriented structure favors to low mold shrinkage and good stress whitening resistance to IPP. When the molecular weight of EBC soluble is high enough,the IPP prepared exhibits a typical island-like rubber phase during the injection molding process,representing higher mold shrinkage and poor resistance to stress whitening.
The structure of impact polypropylene(IPP) with ethylene/1-butenen copolymer(EBC) as rubber phase were analyzed by nuclear magnetic resonance spectrometer,gel permeation chromatograph,differential scanning calorimeter,and scanning electron microscope. The mold shrinkage and stress whitening properties of the copolymer were measured. The results show that when the molecular weight of EBC soluble is low,the IPP prepared is under the action of shear stress during the injection molding process and forms a columnar oriented structure in the melt flow direction. This rubber phase oriented structure favors to low mold shrinkage and good stress whitening resistance to IPP. When the molecular weight of EBC soluble is high enough,the IPP prepared exhibits a typical island-like rubber phase during the injection molding process,representing higher mold shrinkage and poor resistance to stress whitening.
引文
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[14]雷佳伟,金滟,康鹏,等.聚丙烯应力发白影响因素研究进展[J].塑料工业,2014,42(1):1-4.
[15]张晓萌,宋文波,胡慧杰,等.聚丙烯多反应器釜内合金的结构与性能[J].石油化工,2015,44(8):953-957.
[2]Nomura T,Nishio T,Maeda S,et al.Influence of heterogeneous textures of polypropylene/ethylene-propylene-rubber blends on dynamic viscoelastic properties in the solid[J].J Soc Rheol Jpn,1994,22(3):155-164.
[3]Dorazio L,Greco R,Martuscell R,et al.Effect of the addition of EPM copolymers on the properties of high density polyethylene/isotactic polypropylene blends:Ⅱ.Morphology and mechanical properties of extruded samples[J].Polym Eng Sci,1983,23(9):489-497.
[4]Gupta A K,Purwar S N.Crystallization of PP in PP/SEBSblends and its correlation with tensile properties[J].J Appl Polym Sci,1984,29(5):1595-1609.
[5]内罗·帕斯奎尼.聚丙烯手册[M].2版.胡友良译.北京:化学工业出版社,2008:255-258.
[6]Yamaguchi M,Miyata H,Nitta K.Compatibility of binary blends of polypropylene with ethylene-α-olefin copolymer[J].J Appl Polym Sci,1996,62(1):87-97.
[7]Yang Jinhai,White J L.Crystallization behavior of polypropylene/ethylene butane copolymer blends[J].J Appl Polym Sci,2012,126(6):2049-2058.
[8]Kontopoulou M,Wang W,Gopakumar T G,et al.Effect of composition and comommer type on the rheology,morphology and properties of ethylene-α-olefin copolymer/polypropylene blends[J].Polymer,2003,44(24):7495-7504.
[9]Zhu Haijin,Monrabal B,Han C C,et al.Phase crystallization behavior of polypropylene in-reactor alloys:insights from both inter-and intramolecular compositional heterogeneity[J].Macromolecules,2008,41(3):826-833.
[10]Hsieh E T,Randall J C.Ethylene-1-butene copolymers.1.Comonomer sequence distribution[J].Macromolecules,1982,15(2):353-360.
[11]Himont Incorporated.Propylene polymer compositions having good transparency and improved impact resistance:EP,0373660A2[P].1990-06-20.
[12]Gahleitner M,Hauer A,Bernreitner K,et al.PP-based model compounds as tools for the development of highimpactethylene-propylene copolymers[J].Int Polym Proc,2002:17(4):318-324.
[13]Hee J J,Kim S D,Choi W,et al.Morphology and stress whitening of heterophasicpoly(propylene)copolymer/high density polyethylene blends[J].Macromol symp,2012,312(1):34-42.
[14]雷佳伟,金滟,康鹏,等.聚丙烯应力发白影响因素研究进展[J].塑料工业,2014,42(1):1-4.
[15]张晓萌,宋文波,胡慧杰,等.聚丙烯多反应器釜内合金的结构与性能[J].石油化工,2015,44(8):953-957.