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(a) Water uptake and volume changes after 6 months immersion water testing with wood and biochar composites made with HDPE; (b) effect of polymer matrix (HDPE or PP) on water absorption and volume changes of wood and biochar composites made with 50% filler after 6 months testing; (c) effect of pyro-gasification temperature on the contact angle of the same materials in (b); (d) effect of filler content of BS400PC on the contact angle.
