Impingement mixing and its effect on the microstructure of RIM polyurethanes

P. Kolodziej, W. P. Yang, C. W. Macosko, S. T. Wellinghoff

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The effect of impingement mixing on the microstructures developed during a reaction injection molding process in a thermoplastic urethane system was investigated. The polyurethane studied was a 4,4′‐diphenylmethane diisocyanate/l,4‐butane diol/poly(propyleneoxide) end‐capped with poly(ethy1eneoxide) polyol system with a 5/4/1 molar ratio. Three different impingement mixing levels ranging from Re = 80 to Re = 210 were implemented by a laboratory RIM machine. The samples were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), optical microscopy, and transmission electron microscopy (TEM). Morphologies of hard‐segment globules, hard‐segment spherulites, and soft‐segment rich matrix were observed. The multiple DSC endotherms were related to different crystalline structures. A higher level of mixing was found to increase the molecular weight and produce more paracrystalline structures. A lower mixing level produced better phase separation and spherulitic structures. High temperature annealing caused transurethanization, which may allow molecular rearrangement and change the crystalline structures.

Original languageEnglish (US)
Pages (from-to)2359-2377
Number of pages19
JournalJournal of Polymer Science Part B: Polymer Physics
Volume24
Issue number10
DOIs
StatePublished - Jan 1 1986

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Reaction injection molding
Polyurethanes
impingement
microstructure
Microstructure
Differential scanning calorimetry
heat measurement
Crystalline materials
diisocyanates
spherulites
urethanes
gel chromatography
scanning
injection molding
globules
Polyols
Urethane
Gel permeation chromatography
Light transmission
Phase separation

Cite this

Impingement mixing and its effect on the microstructure of RIM polyurethanes. / Kolodziej, P.; Yang, W. P.; Macosko, C. W.; Wellinghoff, S. T.

In: Journal of Polymer Science Part B: Polymer Physics, Vol. 24, No. 10, 01.01.1986, p. 2359-2377.

Research output: Contribution to journalArticle

Kolodziej, P. ; Yang, W. P. ; Macosko, C. W. ; Wellinghoff, S. T. / Impingement mixing and its effect on the microstructure of RIM polyurethanes. In: Journal of Polymer Science Part B: Polymer Physics. 1986 ; Vol. 24, No. 10. pp. 2359-2377.
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