화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.22, No.3, 151-162, September, 2010
Export Citation
Modeling of flow-induced crystallization of colored polypropylene in injection molding
Rong Zheng†, R. I. Tanner, D. Lee Wo, Xi-jun Fan, C. Hadinata1, F.S. Costa1, P.K. Kennedy2, P. Zhu3, and G. Edward3
  • School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia
  • 1Autodesk Pty Ltd., 259-261 Colchester Road, Kilsyth, Melbourne, VIC 3137,Australia
  • 295 Ormond Road, Elwood, VIC 3148, Australia
  • 3Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia
E-mail:
We present a study on flow-induced crystallization of an injection-molded isotactic polypropylene (iPP) mixed with colorant additives. Two types of blue colorants were used in the study: one is the ultramarine Blue composed of Sodium Alumino Sulpho Silicate (UB) and the other is the PV Fast Blue composed of Cu-Phthalocyanine (CuPc). The CuPc colorant exhibits increased nucleation of both quiescent and flowinduced crystallization, and results in more oriented microstructures, causing a high degree of anisotropy in material properties and shrinkage of the injection molded parts. In contrast, the nucleating effect of the UB colorant is negligible under the quiescent condition, but becomes notable in the case of short-term shear treatment at high shear rates. The UB colorant does not significantly increase the degree of anisotropy as compared with the virgin iPP. A flow-induced crystallization kinetic model is used in the numerical simulation for the injection molding process, and predicted the colorant effects as observed in experiments.
Keywords:crystallization;colorants;injection molding;shrinkage;morphology
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