Effect of SEPS as a Novel Compatibilizer on the Properties and Morphology of PP/PC/POE Blends

A novel macromolecular compatibilizer, styrene-ethylene-propylene-styrene (SEPS) with high content of styrene, was investigated for the purpose of improving the compatibility of PP (polypropylene)/PC (polycarbonate)/POE (ethylene-octene copolymer) blends. SEPS shows a remarkable compatibilizing effect since it has a particular structure with the EP-compatible aliphatic segments, which is well miscible with the nonpolar PP and olefinic elastomer POE domains, and S-chain segments which exhibit strong affinity with PC because of the similar molecular structure. Its compatibilizing effect was examined in terms of the mechanical, morphological, and thermal properties. The compatibilized PP-based blends represent remarkable improvement in impact strength and balanced tensile strength. When 5 wt % SEPS was added to PP/PC/POE blends (20 wt % POE), the impact strength of the blends was enhanced from 24 to 43 kJ/m2 without obvious drop in the tensile strength. Their morphologies show a decreasing and much more homogeneous size of dispersed PC and POE particles through addition of SEPS, and the fracture surface morphologies change from irregular mosaic to the mix of mosaic and striation, and finally the regularly distant striation. The special morphology structure that resulted from the effect of the compatibilizer could be a key for enhancement of toughness and balanced rigidity of the blends. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

[1]  Huilin Li,et al.  Viscosity reduction and disentanglement in ultrahigh molecular weight polyethylene melt: Effect of blending with polypropylene and poly(ethylene glycol) , 2007 .

[2]  M. Boyce,et al.  Mechanics of Taylor impact testing of polycarbonate , 2007 .

[3]  Xiaoqing Zhang,et al.  Largely improved toughness of PP/EPDM blends by adding nano-SiO2 particles , 2007 .

[4]  Guisheng Yang,et al.  Morphology and mechanical properties of high‐impact polystyrene/elastomer/magnesium hydroxide composites , 2006 .

[5]  Zhiming Qiu,et al.  Synthesis and properties of soluble polyimides based on isomeric ditrifluoromethyl substituted 1,4-bis(4-aminophenoxy)benzene , 2006 .

[6]  Yiqun Liu,et al.  The structure and physical properties of polypropylene and thermoplastic olefin nanocomposites containing nanosilica , 2006 .

[7]  Jun Zhang,et al.  Melt grafting of poly(ethylene-vinyl acetate) copolymer with maleic anhydride , 2006 .

[8]  R. Lehman,et al.  Morphological effects on glass transition behavior in selected immiscible blends of amorphous and semicrystalline polymers , 2006 .

[9]  J. Joo,et al.  Rheological and electrical properties of polycarbonate/multi-walled carbon nanotube composites , 2006 .

[10]  Q. Fu,et al.  Study on the phase structures and toughening mechanism in PP/EPDM/SiO2 ternary composites , 2006 .

[11]  I. Šmit,et al.  Polypropylene/talc/SEBS (SEBS-g-MA) composites. Part 2. Mechanical properties , 2005 .

[12]  Rui Huang,et al.  Toughness mechanism of polypropylene/elastomer/filler composites , 2005 .

[13]  Arthur Wilkinson,et al.  The effects of SEBS-g-maleic anhydride reaction on the morphology and properties of polypropylene/PA6/SEBS ternary blends , 2004 .

[14]  S. Bai,et al.  Microstructures and mechanical properties of polypropylene/polyamide 6/polyethelene-octene elastomer blends , 2004 .

[15]  Jinhai Yang,et al.  Brittle–ductile transition of PP/POE blends in both impact and high speed tensile tests , 2003 .

[16]  C. Ha,et al.  Morphology and properties of PBT/nylon 6/EVA‐g‐MAH ternary blends prepared by reactive extrusion , 2003 .

[17]  J. L. Cuesta,et al.  Improvement of the mechanical properties of an HDPE/PS blend by compatibilization and incorporation of CaCO3 , 2003 .

[18]  M. Narkis,et al.  The effect of interface characteristics on the morphology, rheology and thermal behavior of three-component polymer alloys , 2002 .

[19]  Jiaqi Fan,et al.  Polyamide 6-clay nanocomposites/polypropylene-grafted-maleic anhydride alloys , 2001 .

[20]  Ying Li,et al.  Study on styrene-assisted melt free-radical grafting of maleic anhydride onto polypropylene , 2001 .

[21]  J. Covas,et al.  Monitoring polyolefin modification along the axis of a twin‐screw extruder. II. Maleic anhydride grafting , 2000 .

[22]  S. Wong,et al.  Effect of rubber functionality on microstructures and fracture toughness of impact-modified nylon 6,6/polypropylene blendsPart II. Toughening mechanisms , 2000 .

[23]  K. Gong,et al.  Toughening and strengthening of polypropylene using the rigid–rigid polymer toughening concept Part I. Morphology and mechanical property investigations , 2000 .

[24]  J. Månson,et al.  Influence of hyperbranched polymers on the interfacial tension of polypropylene/polyamide‐6 blends , 1999 .

[25]  Z. Xiaomin,et al.  Morphological, thermal, and mechanical properties of polypropylene/polycarbonate blend , 1997 .

[26]  A. Gupta,et al.  Mechanical properties and morphology of PP/SEBS/PC blends , 1994 .

[27]  A. Yee,et al.  The importance of constraint relief caused by rubber cavitation in the toughening of epoxy , 1993 .

[28]  D. S. Parker,et al.  Toughening mechanisms in core-shell rubber modified polycarbonate , 1990 .

[29]  R. J. Gaymans,et al.  Comments on 'Percolation model for brittle-tough transition in nylon/rubber blends' , 1990 .

[30]  D. Hofmann,et al.  Reply to comments , 1990 .

[31]  Souheng Wu,et al.  PERCOLATION MODEL FOR BRITTLE-TOUGH TRANSITION IN NYLON/RUBBER BLENDS , 1988 .

[32]  Souheng Wu.  A generalized criterion for rubber toughening: The critical matrix ligament thickness , 1988 .

[33]  R. J. Gaymans,et al.  Brittle-tough transition in nylon-rubber blends: effect of rubber concentration and particle size , 1987 .

[34]  Souheng Wu.  Phase structure and adhesion in polymer blends: a criterion for rubber toughening , 1985 .

[35]  S. J. Shaw,et al.  Deformation and fracture behaviour of a rubber-toughened epoxy: 1. Microstructure and fracture studies , 1983 .

[36]  E. Martuscelli,et al.  Effect of the addition of ethylene‐propylene random copolymers on the properties of high‐density polyethylene/isotactic polypropylene blends: Part 1—morphology and impact behavior of molded samples , 1982 .

[37]  F. Chang,et al.  Poly(oxypropylene)-amide grafted polypropylene as novel compatibilizer for PP and PA6 blends , 2001 .