Experimental evidence of the glass transition in a metallocene ethylene-1-octene copolymer and its composites with glass fibre

Experimental evidence is reached by differential scanning calorimetry (DSC) , and modulated differential scanning calorimetry (MDSC), about the existen ce of a glass transition in a commercial ethylene-1-octene copolymer synthe sized with a metallocene catalyst and in its corresponding composites with glass fibre at different content of reinforcement. The glass transition is found in the region from -50 to -45 degreesC depending upon the empirical p rotocol. Its location is quite independent on the fibre content. The presen ce of reinforcement in the polymeric matrix has some influence on the cryst alline regions, since slightly more perfect crystals seem to be obtained in the composites with not very high glass fibre content, judging from the be tter resolution of the (110) diffraction and from the slightly higher melti ng temperatures. However, the normalized crystallinity remains practically unchanged in all the samples. (C) 2001 Elsevier Science Ltd. All rights res erved.