Effect of a Polypropylene Skin on the Hardness of Polyethylene Pipe

Abstract:

Article Preview

This paper investigated the effect of outer polypropylene (PP) skin thickness on the density and calculated hardness of a polyethylene (PE) core pressure pipe. Density of PE pipes with different PP skin thicknesses (including a PE pipe without a skin) was compared and found that the density distribution can be described well by an exponential function and it increased and flattened with increased PP thickness, which was equivalent to a PE layer 2~3 times as thick. Thermal analysis showed that the density increment is derived from the thermal insulation provided by the PP skin and allowed annealing occur during pipe cooling, particularly close to the outer wall. According to the crystallinity and hardness relationship, the relative strengthening effect on hardness and its relationship with PP layer thickness was quantified.

Info:

Periodical:

Edited by:

Helen Zhang, David Jin and X.J. Zhao

Pages:

197-201

Citation:

J. Huang et al., "Effect of a Polypropylene Skin on the Hardness of Polyethylene Pipe", Advanced Materials Research, Vol. 578, pp. 197-201, 2012

Online since:

October 2012

Export:

Price:

$38.00

[1] Wim Elzink, Trenchless replacement with dedicated PE pipes, Proceedings of Trenchless Middle East, Mar 2007, Dubai, UAE.

[2] Michel Biron, Thermoplastics and Thermoplastic Composites: Technical information for Plastics Users, Elsevier, Burlington, 2007, p.238, p.258.

[3] J. Bowman, J. Huang, M. Gilbert and R. Street, Strength Benefits Provided by Skinned Pipe, Proceedings of Plastic Pressure Pipes, Oct 2009, Cologne, Germany.

[4] J. Huang, M. Gilbert and J. Bowman, The Protection Provided by Skinned Polyethylene Pipes in High Ambient Temperature and High Ultraviolet (UV) Regions, Proceedings of Plastic Pipe XV, Sep 2010, Vancouver, Canada.

[5] Standards: ISO 1183-(1987).

[6] F. J. Balta-Calleja and J. Martinez-Salazar: J. Mater. Sci. Vol. 16 (1981), pp.739-751.

[7] J. Martinez-Salazar and F. J. Balta-Calleja: J. Mater. Sci. Vol. 18 (1983), pp.1077-1082.

[8] D. R. Rueda, J. Martinez-Salazar and F. J. Balta-Calleja: J. Mater. Sci. Vol. 20 (1985), pp.834-838.

[9] F. J. Balta-Calleja, D. R. Rueda, J. Garcia-Pena, F. P. Wolf and V. H. Karl: J. Mater. Sci. Vol. 21 (1986), p.1142.

[10] S. Fakirov, M. Krumova, D.R. Rueda: Polymer, Vol. 41 (2000), p.3047.

[11] A. Flores, F. J. Balta Calleja, D. C. Bassett: J. Polym. Sci., Part B: Polym. Phys. Vol. 37 (1999), p.3151.

[12] R. Chiang, P. J. Flory: J. Am. Chem. Soc. Vol. 83 (1961), p.2859.

[13] R. Kitamaru, L Mandelkern: J. Polym. Sci. Part A-2: Polym. Phys. Vol. 8 (1970), p. (2079).

[14] F. E. Karasz, L. D. Jones: J. Phys. Chem. Vol. 71 (1967), p.2234.