Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
The skin-core structure of various injection-molded samples of PP differing by molecular weight and the injection conditions - essentially injection rate and holding pressure - has been studied by microscopy, DSC, WAXS, and IR dichroïsm on microtome sections. The depth distributions of the degree of crystallinity, macromolecular orientation, and beta phase fraction reveal a complex stratification of the morphology. The importance of the holding pressure and its delay of application after the mold filling are underlined.
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