Afiber-reinforced polymer composite consists of a matrix of vinyl ester and reinforcing short fibers of e-glass. the volume fraction of e-glass fibres (fm) is 25%. the modulus of vinyl ester (em) is 3.60 gpa. the modulus of e-glass (er) is 76.0 gpa. find the modulus of the composite (ec). a)-15.6 gpa. b)- 21.7 gpa. c) 30.5 gpa. d)- 57.9 gpa. e)- none of the above

On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)