Anomalous rheological behavior of long glass fiber reinforced polypropylene

Dong Hak Kim; Young Sil Lee; Younggon Son

Korea-Australia Rheology Journal, Vol.24, No.4, 307-312, December, 2012

DOI10.1007/s13367-012-0037-7 Export Citation

Anomalous rheological behavior of long glass fiber reinforced polypropylene

Dong Hak Kim, Young Sil Lee¹, and Younggon Son^{2, †}

Department of Chemical Engineering, Soonchunhyang University, Asan, Chungnam 336743, Republic of Korea
¹FD Group, Cheil Industries Inc, 332-2 Gocheon-dong, Uiwang, Gyeonggi 437-711, Republic of Korea
²Divsion of Advanced Materials Science and Engineering, College of Engineering, Kongju National University, Cheonan, Chungnam 331717, Republic of Korea

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Dynamic rheological properties of PP-based long glass fiber-reinforced thermoplastics (LFT) were investigated. Weight fractions of the glass fibers investigated in the present study ranged from 0.15 to 0.5, which are higher than those of previous studies. We observed very abnormal rheological behavior. Complex viscosity (η*) of the LFT increased with the glass fiber content up to 40 wt. %. However, the η* with a weight fraction of 0.5 is observed to be lower than that of LFT with a weight fraction of 0.4 in spite of higher glass fiber content. From various experiments, we found that this abnormal behavior is analogous to the rheological behavior of a lyotropic liquid crystalline polymer solution and concluded that the abnormal rheological behavior for the LFT is attributed to the formation of a liquid crystal- like structure at high concentrations of long glass fibers.

Keywords:long glass fiber reinforced thermoplastic;polypropylene;abnormal rheological behavior

[References]

Advani SG, Tucker CL III, Journal of Rheology., 34, 367 (1990)
Bush SF, Torres FG, Methven JM, Composites Part A: Applied Science and Manufacturing., 31, 1421 (2000)
Carreau PG, Dekee DCR, Chhabra RP, Rheology of Polymeric Systems., Hanser Publishers, Munich Vienna New York., 1997
Dinh SM, Amstrong RC, Journal of Rheology., 28, 207 (1984)
Flory PJ, Proceedings of the Royal Society A., 234, 73 (1956)
Gabor K, Roger SP, Journal of Polymer Science: Polymer Symposia., 65, 193 (1978)
Greene JP, Wilkes JO, Polym. Eng. Sci., 35(21), 1670 (1995)
Han CD, Multiphase Flow in Polymer Processing, Academic Press. (1981)
Kim JK, Song JH, J. Rheol., 41(5), 1061 (1997)
Laun MH, Colloid & Polymer Science., 262, 257 (1984)
Park JM, Park SJ, Korea-Australia Rheology Journal., 23(4), 219 (2011)
Ranganathan S, Advani SG, Journal of Non-Newtonian Fluid Mechanics., 47, 107 (1993)
Servais C, Luciani A, Manson JAE, J. Non-Newton. Fluid Mech., 104(2-3), 165 (2002)
Thomason JL, Vlug MA, Composites Part A: Applied Science and Manufacturing., 27, 477 (1996)
Thomasset J, Carreau PJ, Sanschagrin B, Ausias G, J. Non-Newton. Fluid Mech., 125(1), 25 (2005)
Tucker III CL, Advani SG, Processing of short-fiber systems, In: Advani SG. editor. Flow and Rheology in Polymer Composites Manufacturing, Elsevier. (1994)
White JL, Principles of Polymer Engineering Rheology., Wiley & Sons Inc. (1990)

[Related Articles]

[1] Advani SG, Tucker CL III, Journal of Rheology., 34, 367 (1990)

[2] Bush SF, Torres FG, Methven JM, Composites Part A: Applied Science and Manufacturing., 31, 1421 (2000)

[3] Carreau PG, Dekee DCR, Chhabra RP, Rheology of Polymeric Systems., Hanser Publishers, Munich Vienna New York., 1997

[4] Dinh SM, Amstrong RC, Journal of Rheology., 28, 207 (1984)

[5] Flory PJ, Proceedings of the Royal Society A., 234, 73 (1956)

[6] Gabor K, Roger SP, Journal of Polymer Science: Polymer Symposia., 65, 193 (1978)

[7] Greene JP, Wilkes JO, Polym. Eng. Sci., 35(21), 1670 (1995)

[8] Han CD, Multiphase Flow in Polymer Processing, Academic Press. (1981)

[9] Kim JK, Song JH, J. Rheol., 41(5), 1061 (1997)

[10] Laun MH, Colloid & Polymer Science., 262, 257 (1984)

[11] Park JM, Park SJ, Korea-Australia Rheology Journal., 23(4), 219 (2011)

[12] Ranganathan S, Advani SG, Journal of Non-Newtonian Fluid Mechanics., 47, 107 (1993)

[13] Servais C, Luciani A, Manson JAE, J. Non-Newton. Fluid Mech., 104(2-3), 165 (2002)

[14] Thomason JL, Vlug MA, Composites Part A: Applied Science and Manufacturing., 27, 477 (1996)

[15] Thomasset J, Carreau PJ, Sanschagrin B, Ausias G, J. Non-Newton. Fluid Mech., 125(1), 25 (2005)

[16] Tucker III CL, Advani SG, Processing of short-fiber systems, In: Advani SG. editor. Flow and Rheology in Polymer Composites Manufacturing, Elsevier. (1994)

[17] White JL, Principles of Polymer Engineering Rheology., Wiley & Sons Inc. (1990)