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The examination of the structure of PP composites with the glass fibre

Kwiatkowski D., Nabiałek J., Gnatowski A.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 7

405-408

Purpose: of the examination is determination of selected physical properties: melting and crystallization temperature for polypropylene PP and its composites with glass fiber during observation the melting and congealing process by means of optical microscope in white light. Design/methodology/approach: Examination of melting and crystallization temperature of polypropylene composites with glass fibre became carried out by means of the set for the microscopic observation of phase transformations. The set consist of polarized microscope and computer system recording. By means of the set the crystal objects were tested during melting and crystallization process of polymer plastic going through the sample in normal light. The melting and crystallization temperatures were determined visuallily. Examination were carried out registering by means of the microphotography at the definite temperature occurring transformations during heating polymer samples and composites with speed of 200 °C /min, and also during cooling with speed of 50 °C/min in white light. Findings: Fibrous filler in the form of the glass fibre nucleation and modifies the process of the crystallization of the polypropylene composites. Research limitations/implications: The influence of other fillers on crystallization process of polypropylene composites will be defined in future. Practical implications: The carried out tests of structure are useful especially for determination how the used filler nucleates and modifies the crystallization process of polypropylene and its composites. Originality/value: The computer system of recording of the picture enables the carrying out of proceeding processes on-screen of the computer monitor and the recording of single frames and sequences the video, what enables more precise analysis of processes occurring at the high speed.