Structure and Properties of Injection-Molded Products

Flow field and cooling condition between injection molding and compression molding are essentially different. In particular, the flow-induced molecular orientation and/or the distorted shape of the dispersed phase have to be considered seriously in the injection molding. This part deals with the relation between morphology and mechanical properties in the injection-molded products for iPP and iPP/EHR blends (65). This is directly important for the industrial application. The characteristics of these samples are summarized in Table 9.5. 

The POM pictures of iPP, immiscible iPP/EHR30(70/30), and miscible iPP/EHR53(70/30) are shown in Fig. 9.39. These materials are produced by an 

Sample K-value Thickness of skin layer, mm F-value I m in core layer, K Xw in core layer, % 

The distribution of birefringence in the thickness direction is depicted in Fig. 9.42. The birefringence values in the skin layer of the iPP/EHR53 are slightly 

The injection-molded sheets sometimes include the hexagonal /1-crystal form. The fraction of j6-form can be estimated from the relative intensity (K-value) of X-ray diffraction peaks of j6-crystal according to Turner Jones et al. (88). As seen in 

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