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STRUCTURAL AND POLYMORPHIC CONSIDERATIONS ON THE EFFECTS OF COPPER PHTHALOCYANINE PIGMENT ON POLYPROPYLENE NUCLEATION

by WILLIS, MICHAEL

Abstract (Summary)
A proposal was made that the effects of copper phthalocyanine pigment, known for its nucleating ability on polypropylene crystallization, should be different for the alpha and beta crystal phase and particle size differences. Crystallization effects of alpha phase and beta phase copper phthalocyanine pigment (alpha-CuPc and beta-CuPc respectively) on polypropylene were investigated using differential scanning colorimetry (DSC) and wide angle x-ray diffraction (WAXD). This study indicated that the pigment-polymer epitaxial relationship was the same for both pigments whereas their effects on the crystallization temperatures and crystallization rates differed. Both pigments equally influenced the b-axial spherulitic growth relative to the a-axis as indicated by peak intensity ratio reduction of the (110) to the (040) diffraction planes. The onset crystallization temperatures and temperatures at maximum heat-flow of the pigmented polypropylene samples were both higher than that of the unpigmented polypropylene control. The polypropylene containing the alpha-CuPc showed a 17C higher temperature at maximum heat-flow and a 50% increase in crystallization rate. The polypropylene containing the beta-CuPc showed a 10C higher temperature at maximum heat-flow and a 17% increase in crystallization rate. Consequently, the alpha-CuPc in this study was a more efficient nucleator than the beta-CuPc. It is presumed that this was due to the smaller particle size of the alpha-CuPc rather than the crystal phase. The effect on the epitaxial relationship appears to be the same for both pigment types.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:polypropylene nucleation spherulite copper phthalocyanine pigment

ISBN:

Date of Publication:01/01/2007

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