Moisture absorption and mechanical degradation of hybrid Pennisetum purpureum/glass–epoxy composites /M.J.M. Ridzuan a , M.S. Abdul Majid a, ⇑ , M. Afendi a , K. Azduwin b , N.A.M. Amin a , J.M. Zahri c , A.G. Gibson - Ridzuan,M.J.M.