By E. Merck, Henry Schenk
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These defects can be adventitious, resulting from side reaction during synthesis. Microstructural defects within the polymer chain generally cannot be incorporated into the crystal unit cell and have to be ejected during the crystallisation process resulting in the formation of permanent amorphous phases. The amorphous phase is generally mobile, since the glass transitions of many crystalline polymers are below ambient temperature. Hence, elasticity in a crystalline polymer is strongly dependent on the presence of tie-molecules.
Another study showed that Glass fiber can be used to increase the tensile strength of LDPE, HDPE and MDPE polymer matrix. The Young’s modulus increased with the increase in the filler . The study of Siaotong et al. , showed that in extrusion process, the screw speed can affect the mechanical properties of the PE composites . They also tried to make PE composites with changing different parameters such as barrel zone temperatures (75-116126-136-146°), screw speed (C118 rpm) and fiber content (5%), Increased the tensile strength of the natural fiber polyethylene composites in case of hybrid composites of natural fibers with synthetic fiber, addition of small amount of synthetic fiber to natural fiber [86, 87].
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