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Influence of chemical modification of wood on the crystallisation of polypropylene

Borysiak, Slawomir, Doczekalska, Beata
European journal of wood and wood products 2006 v.64 no.6 pp. 451-454
Fagus sylvatica, Pinus sylvestris, adhesion, chemical treatment, crystallization, differential scanning calorimetry, esterification, hardwood, maleic anhydrides, polypropylenes, sawdust, sodium hydroxide, softwood, wood mechanical properties, wood treatment
The mechanical properties of wood/polypropylene composites depend strongly on interfacial adhesion between components. However, the application of chemical modification to improve compatibility can influence the supermolecular structure of polypropylene matrix. The experimental material comprised two most common Polish timber species pine wood (Pinus silvestris L.) as a softwood species and beech wood (Fagus silvatica L.) as a hardwood species. The size of wood sawdust ranged from 0.5 to 1.0 mm. Three different types of wood/PP mixture were prepared: (1) PP – untreated wood, (2) PP – NaOH treated wood and (3) PP – esterified wood with maleic anhydride. In this work, the kinetic parameters of crystallization of PP by differential scanning calorimetry were investigated. It is interesting that crystallisation of PP depends on the kind of wood. The chemical treatment of wood caused changes of crystal conversion and half crystallisation time of polypropylene matrix.