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The paper presents preliminary work carried out to prepare and evaluate the blends obtained from an unplasticized polyvinyl chloride) (PVC) compound, formulated with several loadings of TiO2 [between 0 and 10 parts per hundred parts (phr) PVC] and a kraft lignin (Tomlinite) in amounts up to 7.5 phr. A series of blends in which lignin (L) replaced partially or totally the TiO2 filler were made on a laboratory scale. The potential utilization of this type of blend could be in the construction and building industry for outdoor application. The influence of L on the thermal stability and melt processing of the blends are discussed as well as on their stress-strain properties before weathering and after about a 2000 hour artificial weathering period in the presence of UV light, humidity, and moderate temperature. All the data are correlated with those of a PVC control loaded with 10 phr TiO2.
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Feldman et al. (1994) studied this question.
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