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Article Dans Une Revue International Polymer Processing Année : 2012

Stretch-blow molding of PET copolymers - Influence of molecular architecture

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Résumé

The purpose of the paper is to study the influence of molecular architecture of poly(ethylene terephthalate) (PET) on its ability to be processed by stretch-blow molding, which is not well documented in the literature. To evaluate this process ability, it proposes an original strategy combining laboratory analyses and experiments on a prototype machine. PET copolymers were prepared from three types of comonomers: diethylene glycol (DEG), isophthalic acid (IPA) and trimethylolpropane (TMP). It is first shown, through laboratory experiments, that the nature of the polymer in terms of chain constitution (copolymerization), chain length (intrinsic viscosity) and purity (catalytic residues) greatly affects many properties: melt crystallization, thermal properties, polymer rigidity and drawability. These different properties obviously induce very different behaviours at the different steps of the stretch-blow molding process: injection-molding of the preform (quenchability), heating (IR absorption), stretch-blow (rigidity and drawability). The stretch-blow step has been simulated on a prototype apparatus designed in our laboratory. It has been shown that free blowing can be used to characterize the process ability of the polymer. A statistical analysis has confirmed the great differences between the materials investigated and pointed out the complexity of the material response during blowing.
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Dates et versions

hal-00722028 , version 1 (19-09-2012)

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Elise Deloye, Jean-Marc Haudin, Noëlle Billon. Stretch-blow molding of PET copolymers - Influence of molecular architecture. International Polymer Processing, 2012, 27 (3), pp.358-369. ⟨10.3139/217.2549⟩. ⟨hal-00722028⟩
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