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Toughening of polypropylene combined with nanosized CaCO 3 and styrene–butadiene–styrene
Author(s) -
Yu Jianghua,
Wang Guoquan,
Chen Jianfeng,
Zeng Xiaofei,
Wang Wenyi
Publication year - 2007
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20480
Subject(s) - materials science , composite material , polypropylene , ultimate tensile strength , izod impact strength test , composite number , flexural strength , nanocomposite , toughness , particle size , particle (ecology) , nanoparticle , chemical engineering , nanotechnology , oceanography , engineering , geology
Nanocomposites of nanosized CaCO 3 /SBS/PP were prepared by using twin‐screw and single‐screw extruder. By adding nanosized CaCO 3 particles into SBS/PP blend, the notched impact strength, flexural modulus, and tensile strength of the composites can be improved, whereas, by adding microsized CaCO 3 particles into SBS/PP blend, the notched impact strength of the composite is decreased markedly. At nanosized CaCO 3 content of 16 phr (parts per hundred PP resin by weight), the impact strength of nanosized CaCO 3 /SBS/PP composite reaches 56.55 KJ/m 2 , which is 1.27 times that of SBS/PP blend. At nanosized CaCO 3 content of 4 phr, the tensile strength of the composites reaches 31.3 MPa, which is 1.23 times that of SBS/PP blend. The maximum and balanced torque of the composites improves significantly by the addition of CaCO 3 nanoparticles. The increased shear force during compounding continuously breaks down SBS particles, resulting in the reduction of the SBS particles size, and improving the dispersion of SBS particles in PP matrix. Thus the toughening effect of SBS on matrix was improved. Simultaneously, the existence of SBS provides the matrix with a good intrinsic toughness, satisfying the condition that nanosized inorganic particle of CaCO 3 efficiently toughens polymer matrix. The synergistic toughening function of nanosized CaCO 3 and SBS on PP matrix was exhibited. POLYM. ENG. SCI. 47:201–206, 2007. © 2007 Society of Plastics Engineers