# PROCESSING-INDUCED MORPHOLOGY: ITS RELATIONSHIP WITH TENSILE-IMPACT BEHAVIOUR IN INJECTION-MOULDED POLYPROPYLENE

> Title: PROCESSING-INDUCED MORPHOLOGY: ITS RELATIONSHIP WITH TENSILE-IMPACT BEHAVIOUR IN INJECTION-MOULDED POLYPROPYLENE Page Range: p.563-576 Author(s): LaFranche E; Brassart G; Krawczak P File size: 296K Download the pdf (subscribers only) Buy the pdf (non-subscribers) Journal: Polymers and Polymer Composites Issue Year: ppc Volume:...

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Published: 2006-06-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: PROCESSING-INDUCED MORPHOLOGY: ITS RELATIONSHIP WITH TENSILE-IMPACT BEHAVIOUR IN INJECTION-MOULDED POLYPROPYLENE**
 Page Range: p.563-576
 Author(s): LaFranche E; Brassart G; Krawczak P
 File size: 296K
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc14-6&JournalID=100309&JIP=) (subscribers only)
 ![](http://handbuy.gif) Buy the pdf (non-subscribers)
 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 14
 Issue No: No. 6

**Abstract**
 The main parameters influencing the tensile-impact strength of injection moulded propylene during high volume manufacturing of automotive parts, have been identified. A Taguchi Design of Experiments analysis showed that the key parameters n both flow and transverse directions were the polymer melt and mould temperatures, and the volumetric flow rate. differences in high-speed mechanical behaviour are explained on the basis of an investigation of the processing-induced morphology/tensile-impact behaviour relationship. An through-the-thickness analysis was made of the microstructure of parts manufactured under two extreme sets of moulding conditions by means of microscopy and crystallinity measurement, molecular orientation and thermal expansion. It was found that the brittleness of the injection moulded part depended on the skin layer's morphology, the main influential parameters being the skin/core ratio and the crystalline structure. The crack initiation energy increased wit the oriented skin layer thickness, whereas the brittleness increased with the crystallinity level and the spherulite size. 30 refs.

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