Using Dynamic Mechanical Spectroscopy to Monitor the Crystallization of PP/MAPP Blends in the Presence of Wood

Michael P. Wolcott; Suzhou Yin; Timothy G. Rials

Treesearch

Using Dynamic Mechanical Spectroscopy to Monitor the Crystallization of PP/MAPP Blends in the Presence of Wood

Informally Refereed

Authors:

Michael P. Wolcott, Suzhou Yin, Timothy G. Rials

Year:

2000

Type:

Scientific Journal

Station:

Southern Research Station

Source:

Composite Interfaces Vol. 7, No. 1, pp. 3-12,(2000)

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Abstract

Crystal morphology of thermoplastics is known to be strongly influenced by the presence of solid suhstrntes like fibers or fillers. For wood, this interphase development is govemed by the chemical composition of the thermoplastic and substrate. The crystallization of PP/MAPP blends WBS observed using polarized light microscopy and quantified using DSC and DM.4. Techniques are presented to assess degree of crystallinity and temperatures associated with the onset (T_o) and maximum rate (T_c), of crystallization using DMA. Strain history of the specimen during crystallization was evahndted and does not significantly infiucnce either T_o or T_c. Crystallization temperatures of PP as assessed using DSC or DMA increase with the addition of MAPP or the presence of wood. Values for Tc are higher when measured by DMA than DSC. This difference appears to be related more to the relative interfacial dominance in the specimens, rather than to an inherent difference between techniques.

Keywords

Wood, polypropylene, maleic anhydride, dynamic mechanical analysis, transcrystallinity

Citation

Wolcott, Michael P.; Yin, Suzhou; Rials, Timothy G. 2000. Using Dynamic Mechanical Spectroscopy to Monitor the Crystallization of PP/MAPP Blends in the Presence of Wood. Composite Interfaces Vol. 7, No. 1, pp. 3-12,(2000)