Surface Degradation and Mechanical Properties of PVC/Wood-Pallet Composite under UV-Weathering Environment
This research studied the effects of 4 types of additives, , wood powder, UV-absorber, impact modifier and pigment, on UV-stability of PVC/Wood-Pallet prepared by extrusion process. The amount of additive used was varied from 0 35 %w/w. The central composite design (CDD) was employed to experimentally design the formulation of PVC/Wood-Pallet, in order to practically reduce the total number of experiments from 625 pipes (Full factorial design for 4 factors and 5 levels) to 30 pipes without losing the credibility of the results achieved. The photodegradation of the PVC/Wood-Pallet was performed by an outdoor exposure test. The progress of photodegradation was followed by determining the changes in mechanical properties, physical properties and appearance, and thermal properties as a function of exposure time. The results showed that the PVC/Wood-Pallet No.30 had better mechanical properties than the others over period of exposure time. In addition, it was found that UV exposure could actually improve short-term mechanical properties due to postcuring phenomenon.
B. Sreenual et al., "Surface Degradation and Mechanical Properties of PVC/Wood-Pallet Composite under UV-Weathering Environment", Advanced Materials Research, Vol. 506, pp. 548-551, 2012