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Abstract

An investigation of the foaming behavior of polybutylene terephthalate (PBT) resins in extrusion is performed. Commercial grades of PBT with different molecular weights and rheological characteristics are chosen. PBTs with a high temperature chemical blowing agent are extruded under different material and operational conditions (e.g., amount of blowing agent, set temperature at the die, screw RPM, etc.) to allow the understanding of the effects of those conditions on product characteristics. The foamed extrudates are analyzed for density, morphology, and crystallinity. It is shown that the foaming behavior and the foam quality of PBT are functions of the characteristic properties of the resins including rheological and crystallization behavior.

Keywords

PBT chemical blowing agent extrusion foaming crystallinity

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References

Xanthos, M. and Dey, S.K. (2000). Foam Extrusion of Polyethylene Terephthalate, In: Lee, S.T. (ed.), Foam Extrusion, Chapter 12, Technomic Publishing, Lancaster, Pennsylvania .

Xanthos, M. , Dey, S.K. , Zhang, Q. and Quintans, J. (2000). Parameters Affecting Extrusion Foaming of PET by Gas Injection , J. Cell. Plast., 36: 102-111 .

Xanthos, M. , Zhang, Q. , Dey, S.K. , Li, Y. and Quintans, J. (1998). Effects of Resin Rheology on the Extrusion Foaming Characteristics of PET , J. Cell. Plast., 34: 498-111 .

Klotzer, R. , Paul, D. and Seibig, B. (1997). Extrusion of Microcellular Foams and Applications, SPE ANTEC ’97, pp. 2042-2045.

Song, K. , Li, W. , Eckert, Jr., J.O. , Wu, D. and Apfel, R.E. (1999). Generation of Novel Microstructures in Rapidly Foamed Polybutylene Terephthalate , J. Material Sci., 34: 5387-5395 .

Illers, K.H. (1980). Heat of Fusion and Specific Volume of Poly(ethylene terephthalate) and Poly(butylene terephthalate) , Colloid & Polymer Sci., 258: 117-124 .

Zhang, Q. and Xanthos, M. (2004). Material Properties Affecting Extrusion Foaming, In: Lee, S.T. (ed.), Polymeric Foams; Mechanics and Materials, Chapter 5, CRC Press, New York .

Spitael, P. and Macosko, C.W. (2004). Strain Hardening in Polypropylenes and its Role in Extrusion Foaming , Polym. Eng. Sci., 44: 2090-2100 .

Yilmazer, U. , Xanthos, M. , Bayram, G. and Tan, V. (2000). Viscoelastic Characteristics of Chain Extended/Branched and Linear Polyethylene Terephthalate , J. Applied Polym. Sci., 75: 1371-1377 .

10.

Al-Raheil, I.A. and Qudah, A.M.A. (1995). Morphology and Melting Behaviour of Poly(butylene terephthalate) , Polym. International, 37: 47-52 .

Extrusion Foaming Behavior of PBT Resins

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