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化工学报  2015 

长支链聚丙烯诱导β晶成核效应

DOI: 10.11949/j.issn.0438-1157.20150846, PP. 3788-3794

Keywords: β晶,成核剂,长支链聚丙烯,力学性能

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Abstract:

利用乙烯基聚二甲基硅氧烷/苯乙烯接枝型长支链聚丙烯(PP-g-VS/St)在剪切和快速降温过程中可以诱导形成β晶聚丙烯这一优势,研究了PP-g-VS/St在注塑加工过程中作为高分子β晶成核剂对等规聚丙烯(iPP)结晶温度、晶体结构及力学性能的影响。结果表明改性聚丙烯的结晶温度、β晶相对含量和力学性能随着PP-g-VS/St添加量的增加而增加。当PP-g-VS/St的添加量为50%(质量分数)时,改性聚丙烯的结晶温度相对于纯iPP提高约10℃,β晶相对含量达32.8%,冲击强度、弯曲模量和拉伸强度分别相对于纯iPP提高了355.3%、53.8%和15.9%。这些结果为聚丙烯高分子β晶型成核剂的设计提供了新思路。

References

[1]  Yoshida H. Dynamic analysis of the melting behavior of polymers showing polymorphism observed by simultaneous DSC/X-ray diffraction measurements [J]. Thermochim. Acta, 1995, 267: 239-248.
[2]  Fujiwara Y. Double-melting behavior of the β-phase of isotactic polypropylene [J]. Colloid Polym. Sci., 1975, 253 (2): 273-282.
[3]  Somani R H, Hsiao B S, Nogales A, Fruitwala H, Srinivas S, Tsou A H. Structure development during shear flow induced crystallization of i-PP: in situ wide-angle X-ray diffraction study [J]. Macromolecules, 2001, 34 (17): 5902-5909.
[4]  Varga J. Characteristics of cylindritic crystallization of polypropylene [J]. Macromol. Mater. Eng., 1983, 112 (1): 191-203.
[5]  Huo H, Jiang S, An L, Feng J. Influence of shear on crystallization behavior of the β phase in isotactic polypropylene with β-nucleating agent [J]. Macromolecules, 2004, 37 (7): 2478-2483.
[6]  Zheng Q, Shangguan Y, Tong L, Peng M. Effect of vibration on crystal morphology and structure of isotactic polypropylene in nonisothermal crystallization [J]. J. Appl. Polym. Sci., 2004, 94 (5): 2187-2195.
[7]  Boucher E, Folkers J P, Creton C, Hervet H, Léger L. Enhanced adhesion between polypropylene and polyamide-6: role of interfacial nucleation of the β-crystalline form of polypropylene [J]. Macromolecules, 1997, 30 (7): 2102-2109.
[8]  Garbarczyk J, Paukszta D, Borysiak S. Polymorphism of isotactic polypropylene in presence of additives, in blends and in composites [J]. J.Macromol. Sci. B, 2002, 41 (4/5/6): 1267-1278.
[9]  Feng M, Gong F, Zhao C, Chen G, Zhang S, Yang M, Han C C. The β-crystalline form of isotactic polypropylene in blends of isotactic polypropylene and polyamide-6/clay nanocomposites [J]. J. Polym. Sci., Part B: Polym. Phys., 2004, 42 (18): 3428-3438.
[10]  Varga J, Schulek-Tóth F, Mudra I. Blends of the β-modification of polypropylene [J]. Macromol. Symp., 1994, 78 (1): 229-241.
[11]  Wang K, Zhou C. The effects of melt vibration blending on the subsequent crystallization and melting behavior of polypropylene/ultra high molecular weight polyethylene [J]. Polym. Eng. Sci., 2001, 41 (12): 2249-2258.
[12]  Phillips A, Zhu P, Edward G. Polystyrene as a versatile nucleating agent for polypropylene [J]. Polymer, 2010, 51 (7): 1599-1607.
[13]  Wang C, Chu Y, Wu Y. Electrospun isotactic polystyrene nanofibers as a novel β-nucleating agent for isotactic polypropylene [J]. Polymer, 2012, 53 (23): 5404-5412.
[14]  Zhou S, Zhao S, Xin Z. Preparation and foamability of high melt strength polypropylene based on grafting vinyl polydimethylsiloxane and styrene [J]. Polym. Eng. Sci., 2015, 55 (2): 251-259.
[15]  Zhou S, Zhao S, Xin Z, Wang W. A novel strategy for achieving high melt strength polypropylene and an investigation of its foamability [J]. J.Macromol. Sci. B, 2014, 53 (10): 1695-1714.
[16]  Zhou Shuai (周帅), Xin Zhong (辛忠), Zhao Shicheng (赵世成). Influences of shearing and cooling rate on the crystal structure of long chain branched polypropylene [J]. Petrochemical Technology (石油化工), 2013, 42 (4): 430-434.
[17]  Stocker W, Schumacher M, Graff S, Thierry A, Wittmann J C, Lotz B. Epitaxial crystallization and AFM investigation of a frustrated polymer structure: isotactic poly (propylene), β phase [J]. Macromolecules, 1998, 31 (3): 807-814.
[18]  Yamamoto Y, Inoue Y, Onai T, Doshu C, Takahashiand H,Uehara H. Deconvolution analyses of differential scanning calorimetry profiles of β-crystallized polypropylenes with synchronized X-ray measurements [J]. Macromolecules, 2007, 40 (8): 2745-2750.
[19]  Zhao S, Cai Z, Xin Z. A highly active novel β-nucleating agent for isotactic polypropylene [J]. Polymer, 2008, 49 (11): 2745-2754.
[20]  Jones A T, Aizlewood J M, Beckett D. Crystalline forms of isotactic polypropylene [J]. Macromol. Chem. Phys., 1964, 75 (1): 134-158.
[21]  Su Z, Dong M, Guo Z, Yu J. Study of polystyrene and acrylonitrile- styrene copolymer as special β-nucleating agents to induce the crystallization of isotactic polypropylene [J]. Macromolecules, 2007, 40 (12): 4217-4224.
[22]  Deng S, Zhao X, Huang Y, Han X, Liu H, Hu Y. Deformation and fracture of polystyrene/polypropylene blends: a simulation study [J]. Polymer, 2011, 52 (24): 5681-5694.
[23]  Liang Y, Jensen R E, Pappas D D, Palmese G R. Toughening vinyl ester networks with polypropylene meso-fibers: interface modification and composite properties [J]. Polymer, 2011, 52 (2): 510-518.
[24]  Wang J, Niu H, Dong J, Du J, Han C C. Morphology and mechanical properties of polypropylene/poly (propylene-1-octene) in-reactor alloys prepared by metallocene/Ziegler-Natta hybrid catalyst [J]. Polymer, 2012, 53 (7): 1507-1516.
[25]  J?rgensen J K, Redford K, Ommundsen E, Stori A. Molecular structure and shear rheology of long chain branched polypropylene formed by light cross-linking of a linear precursor with 1,3-benzenedisulfonyl azide [J]. J. Appl. Polym. Sci., 2007, 106 (2): 950-960.
[26]  Gotsis A, Zeevenhoven B, Tsenoglou C. Effect of long branches on the rheology of polypropylene [J]. J. Rheol., 2004, 48 (4):895-914.
[27]  Zhao W, Huang Y, Liao X, Yang Q. Molecular structure characteristics of long chain branched polypropylene and its effects on non-isothermal crystallization and mechanical properties [J]. Polymer, 2013, 54 (4): 1455-1462.

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