Development of a Novel Pvt Measuring Technique

Abstract:

The pressure-temperature-specific volume relation of polymers is important not only for physical chemistry, but they are very significant input data for injection molding simulation software. Todays methods for measuring pvT data are slow, measurements can take days to be carried out, and in many cases the accuracy of the measurement is unsatisfactory. In our work, a new measuring method has been developed which makes the determination of the pvT relation faster compared to conventional processes within injection molding processing conditions. For the measurements a special injection mould was developed, in which the pvT relation of the material can be determined from the shrinkage in the mold. The data measured by the new method using polypropylene at a mold temperature of 23°C were compared to the data given in the database of the simulation software.

• Periodical: Materials Science Forum (Volume 729)
• Pages: 126-131
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.729.126
• Online since: November 2012
• Authors: Ferenc Szabó, József Gábor Kovács
• Keywords: Injection Molding, Pressure-Volume-Temperature, PVT

References

[1] S. Chakravorty, PVT testing of polymers under industrial processing conditions, Polymer Testing 21 (2002) 313–317.

DOI: 10.1016/s0142-9418(01)00089-7

[2] J. -F. Luyé, PVT measurement methodology for semicrystalline polymers to simulate injection-molding process, Journal of Applied Polymer Science 79 (2001) 302–311.

DOI: 10.1002/1097-4628(20010110)79:2<302::aid-app120>3.0.co;2-i

[3] J. Wang, P. Xie, Y. Ding, W. Yang, On-line testing equipment of P–V–T properties of polymers based on an injection molding machine, Polymer Testing 28 (2009) 228–234.

DOI: 10.1016/j.polymertesting.2008.09.003

[4] G. Menges, P. Thienel, Pressure-Specific Volume-Temperature Behavior of Thermoplastics Under Normal Processing Conditions, Polymer Engineering and Science 17 (1977) 758-763.

DOI: 10.1002/pen.760171011

[5] A. Sorrentino, L. Vertuccio, V. Vittoria, Influence of multi-walled carbon nanotubes on the β form crystallization of syndiotactic polystyrene at low temperature, eXPRESS Polymer Letters 4 (2010) 339–345.

DOI: 10.3144/expresspolymlett.2010.43

[6] M.H.E. van der Beek, G.W.M. Peters, H.E.H. Meijer, Characterization of polymers for improved shrinkage prediction in micromolding, in: W., Dimov S. (Eds. ), 4M2005: First International Conference on Multi-Material Micro Manufacture, Elsevier, Amsterdam, 2005, pp.115-118.

[7] R. Forstner, G. W. M. Peters, H. E. H. Meijer, A novel dilatometer for pvT measurements of polymers at high cooling - and shear rates, International Polymer Processing 24 (2009) 114-121.

DOI: 10.3139/217.2154

[8] R.E. Nunn, U.S. Patent 4, 850, 217. (1989).

[9] S. Rogelj, M. Krajnc, Pressure and temperature behavior of thermoplastic polymer melts during high-pressure expansion injection molding, Polymer Engineering and Science 48 (2008) 1815-1823.

DOI: 10.1002/pen.21149

[10] N. Sadeghian, M. Golzar, PVT measurement system for wood plastic composite melt in an extrusion process, Journal of Reinforced Plastics and Composites, 27 (2008) 739-750.

DOI: 10.1177/0731684407084250

[11] S.S. Park, C.B. Park, D. Ladin, H.E. Naguib, C. Tzoganakis, Development of a dilatometer for measurement of the pvT properties of a polymer/CO2 solution using a foaming extruder and a gear pump, Journal of Manufacturing Science and Engineering 124 (2002).

DOI: 10.1115/1.1418696

[12] Y.G. Li, C.B. Park, H.B. Li, J. Wang, Measurement of the PVT property of PP/CO2 solution, Fluid Phase Equilibria 270 (2008) 15–22.

DOI: 10.1016/j.fluid.2008.05.007

[13] J.G. Kim, H. Kim, H.S. Kim, J.W. Lee, Investigation of pressure-volume-temperature relationship by ultrasonic technique and its application for the quality prediction of injection molded parts, Korea-Australia Rheology Journal 16 (2004) 163-168.