Structure and properties of composites of polyethylene or maleated polyethylene and cellulose or cellulose esters |
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Authors: | P. M. Kosaka Y. Kawano H. M. Petri M. C. A. Fantini D. F. S. Petri |
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Affiliation: | 1. Instituto de Química, Universidade de S?o Paulo, Avenida Professor Lineu Prestes 748, 05508‐900, S?o Paulo, SP, Brazil;2. Thermo Electron Corporation, P.O. Box 26027, 05513‐970 S?o Paulo, SP, Brazil;3. Instituto de Física, Universidade de S?o Paulo, P.O. Box 66318, 05315‐970, S?o Paulo, SP, Brazil |
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Abstract: | Composites of linear low‐density poly(ethylene‐co‐butene) (PE) or maleated linear low‐density poly (ethylene‐co‐butene) (M‐PE) and cellulose (CEL), cellulose acetate (CA), cellulose acetate propionate (CAP), or cellulose acetate butyrate (CAB) were prepared in an internal laboratory mixer with 20 wt % polysaccharide. The structure and properties of the composites were studied with tensile testing, dynamic mechanical thermal analysis, differential scanning calorimetry, extraction with a selective solvent, Raman spectroscopy, and X‐ray diffraction. Composites prepared with M‐PE presented yield stress and elongation values higher than those of composites prepared with PE, showing the compatibilizer effect of maleic anhydride. Dynamic mechanical thermal analysis performed for M‐PE–CEL, M‐PE–CA, M‐PE–CAP, and M‐PE–CAB composites showed one glass‐transition temperature (Tg) close to that observed for pure M‐PE, and for M‐PE–CAP, another Tg lower than that measured for the polysaccharide was observed, indicating partial mutual solubility. These findings were confirmed by the extraction of one phase with a selective solvent, gravimetry, and Raman spectroscopy. X‐ray diffraction showed that the addition of CEL, CA, CAP, or CAB had no influence on the lattice constants of PE or M‐PE, but the introduction of the reinforcing material increased the amorphous region. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103:402–411, 2007 |
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Keywords: | composites polyethylene (PE) polysaccharides solid‐state structure structure‐property relations |
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