MSA  Vol.5 No.8 , June 2014
Some Practical Aspects of the Oxidative Stability of Polypropylene Pipes
ABSTRACT
The oxidation time and oxidation temperature of a total of 20 specimens with unknown pre-history from various manufacturers of polyethylene and poly(ethylene-co-propylene) are determined. The specimens are in the form of fittings used in piping. The specimens are divided into two groups corresponding to their melting temperature and polyethylene content in the copolymer, respectively. The oxidation activation energy for the two groups is calculated. Reasonable relationship between the measured oxidation time and the time, calculated on the base of the measured oxidative temperature, is obtained. The scattering of experimental data is thoroughly examined and some recommendations aiming at improving the results are suggested. Specific recommendations are given for the cases of technological and post consummative piping waste. The paper critically estimates the accuracy in the measured oxidation time and temperature as well as their mutual relation.

Cite this paper
Apostolov, A. and Djoumaliisky, S. (2014) Some Practical Aspects of the Oxidative Stability of Polypropylene Pipes. Materials Sciences and Applications, 5, 579-591. doi: 10.4236/msa.2014.58060.
References
[1]   Zdravotny ustav se sidlem v Ostrave, protokolu o zkousce evid, C1411/2003.

[2]   ASTM D 3895-07, Test Method for Oxidative Induction Time of Polyolefins by DSC.

[3]   DIN (ISO 11357-6:2008).

[4]   Beaumier, D and Blond, E. (2008) Durability of Polypropylene Tubes “Draintube”. SAGEOS, File S006-159.

[5]   Viebke, J. and Gedde, U.W. (1998) Assessment of Lifetime of Hot-water Polyethylene Pipes Based on Oxidation Induction Time Data, Polymer Engineering and Science, 38, 1244-1250.
http://dx.doi.org/10.1002/pen.10293

[6]   Marcus, S.M. and Blaine, R.L. (1997) Estimation of Bias in the Oxidative Induction Time Measurement by Pressure DSC, TA Instruments. Inc., New Castle, DE 19720.

[7]   Ezrin, M., Zepke, A., Helwig, J., Lavigne, G. and Dudley, M. (2001) Plastic Failure Due to Oxidative Degradation in Processing and Service. In: Moalli, J., Ed., Plastic Failure Analysis and Prevention, Plastics Design Library, Norwich.

[8]   Jakoby, P. (2003) The Effect of Hindered Phenol Stabilizers on Oxygen Induction Time (OIT) Measurements, and the Use of OIT Measurements to Predict Long Term Thermal Stability.
http://www.pstc.org/files/public/Jacoby.pdf

[9]   Schmid, M., Ritter, A. and Affolter, S. (2006) Determination of Oxidation Induction Time and Temperature by DSC, Journal of Thermal Analysis and Calorimetry, 83, 367-371.
http://dx.doi.org/10.1007/s10973-005-7142-5

[10]   Sorin I.E. and Radu S. (2009) TE-VSC, Polymeric Materials Review on Oxidation, Stabilization and Evaluation Using CL and DSC Methods, TE Technical Note.
Sorin.Ilie@cern.ch

[11]   Kato M. and Osawa Z. (1999) Effect of Stereoregularity on the Thermo-Oxidative Degradation of Polypropylenes. Polymer Degradation and Stability, 65, 457-461.

[12]   Dibelo, P.M., Manganaro, J.L. and Aguinaldo, E.R. (1991) Encyclopedia of Chemical Technology. 4th Edition, John Wiley, New York, 938.

[13]   Bruno, F., Richaud, E., Verdu, J. and Farcas, F. (2008) Embrittlement of Polypropylene Fibre during Thermal Oxidation, Journal of Material Science, 43, 1026-1032.
http://dx.doi.org/10.1007/s10853-007-2242-1

[14]   Blaine, R.L., Lundgren, C.J. and Harris, M.B. (1997) Oxidative Induction Time—A Review of DSC Experimental Effects. In: Riga, A.T. and Patterson, G.H., Eds., Oxidative Behavior of Materials by Thermal Analytical Techniques, ASTM STP 1326, ASTM.

[15]   Patterson, G.H. and Riga, A.T. (1993) Factors Affecting Oxidation Properties in Differential Scanning Calorimetric Studies. Thermochimica Acta, 226, 201-210.
http://dx.doi.org/10.1016/0040-6031(93)80221-U

[16]   Wunderlich, B. (1976) Macromolecular Physics, Volume 2: Crystal Nucleation, Growth, Annealing. Academic Press, New York.

[17]   Boor Jr., J. (1979) Ziegler-Natta Catalysts and Polymerization. Academic Press, New York.

[18]   Keith, H.D. and Padden Jr., F.J. (1964) Spherulitic Crystallization from the Melt. II. Influence of Fractionation and Impurity Segregation on the Kinetics of Crystallization. Journal of Applied Physics, 35, 1286-1296.
http://dx.doi.org/10.1063/1.1713607

[19]   Essential Chemical Industry, CIEC Promoting Science.
http://www.essentialchemicalindustry.org

[20]   Suitall Catalog Data of PP-R Pipes & Fittings, Suitall Polypro Limited.
http://www.indiamart.com/suitall-polypro-limited/products.html

[21]   Ye, P., Tan, B.C. (2012) How to Optimize OIT Tests? Application Note.
www.perkinelmer.com

[22]   Lv, Y.D., Huang, Y.J., Kong, M.Q. and Li, G.X. (2013) Improved Thermal Oxidation Stability of Polypropylene Films in the Presence of β-Nucleating Agent. Polymer Testing, 32, 179-186.
http://dx.doi.org/10.1016/j.polymertesting.2012.10.008

[23]   Starink, M.J. (2003) The Determination of Activation Energy from Linear Heating Rate Experiments: A Comparison of the Accuracy of Isoconversion Methods. Thermochimica Acta, 404, 163-176.
http://dx.doi.org/10.1016/S0040-6031(03)00144-8

[24]   Madhusudanan, P.M., Krishnam, K. and Ninan, K.N. (1986) New Approximation for the p(x) Function in the Evaluation of Non-isothermal Kinetic Data. Thermochimica Acta, 97, 189-201.
http://dx.doi.org/10.1016/0040-6031(86)87019-8

[25]   Tang, W., Liu, Y., Zhang, H. and Wang, C. (2003) New Approximate Formula for Arrehenius Temperature Integral. Thermochimica Acta, 408, 39-43.
http://dx.doi.org/10.1016/S0040-6031(03)00310-1

[26]   Focke, W.W. and van der Westhuizen, I. (2010) Oxidation Induction Time and Oxidation Onset Temperature of Polyethylene in Air. Journal of Thermal Analysis and Calorimetry, 99, 285-293.
http://dx.doi.org/10.1007/s10973-009-0097-1

[27]   Marshall, D.I., George, E.J., Turnipseed, J.N. and Glenn, J.L. (1973) Measurement of Oxidation Stability of Polyolefins by Thermal Analysis. Polymer Engineering and Science, 13, 415-421.
http://dx.doi.org/10.1002/pen.760130604

[28]   Bockhorn, H.A., Hornung, A., Hornung, U. and Schawaller, D. (1999) Kinetic Study on the Thermal Degradation of Polypropylene and Polyethylene, Journal of Analytical and Applied Pyrolysis, 48, 93-109.
http://dx.doi.org/10.1016/S0165-2370(98)00131-4

[29]   Ballice, L. and Reimert, R. (2002) Classification of Volatile Products from the Temperature-Programmed Pyrolysis of Polypropylene (PP), Atactic-Polypropylene (APP) and Thermogravimetrically Derived Kinetics of Pyrolysis. Chemical Engineering and Processing, 41, 289-296.
http://dx.doi.org/10.1016/S0255-2701(01)00144-1

[30]   Gimzewski, E. (1992) The Relationship between Oxidation Induction Temperatures and Times for Petroleum Products. Thermochimica Acta, 198, 133-140.
http://dx.doi.org/10.1016/0040-6031(92)85067-6

[31]   Peterson, J.D., Vyazovkin, S. and Wight, C.A. (2001) Kinetics of the Thermal and Thermo-Oxidative Degradation of Polystyrene, Polyethylene and Poly (Propylene). Macromolar Chemistry and Physics, 202, 775-784.

[32]   Shibryaeva, L. (2012) Thermal Oxidation of Polypropylene and Modified Polypropylene-Structure Effects.
http://www.intechopen.com/books/polypropylene/thermal-oxidation-of-polypropylene-and-modified-polypropylene-structure-effects

[33]   Lugao, A.B., Cardoso, C.L., Hutzler, B., Machado, L.D.B. and Conceicao, R.N. (2002) Temperature Dependent Oxidative-Induction Time (TOIT) of Irradiated and Non-Irradiated Polypropylene—A New Method. Radiation Physics and Chemistry, 63, 489-492.
http://dx.doi.org/10.1016/S0969-806X(01)00544-8

 
 
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