Changes in Crystallinity of the HDPE Matrix in Composites with Cellulosic Fiber Using DSC and FTIR

The ageing of HDPE/cellulosic fiber composite exposed to drastic weather and the percentages of cellulosic fibers are responsible for some changes in the crystallinity of component matrix (HDPE). Two types of samples have been evaluated during different periods of time (up to 90 days). One in which cellulosic fibers have not been treated and another in which fibers have been given a treatment with a coupling agent, silane type, which favours the fiber adhesion to the matrix. Two instrumental analysis techniques have been used to determine the crystallinity changes of HDPE: Fourier Transform Infrared spectrophotometry (FTIR) and Differential Scanning Calorimetry (DSC).