Structures and properties of injection moldings of crystallization nucleator-added polypropylenes. II. Distribution of higher-order structures

✍ Scribed by Mitsuyoshi Fujiyama; Tetsuo Wakino

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 736 KB
• Volume: 42
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1991.070421013

✦ Synopsis

Flexural test specimens were injection-molded from polypropylenes added with 0.5 wt % calcium carbonate, talc, p-tert-dibutyl-benzoic acid monohydroxy aluminum, or p -dimethyl-benzylidene sorbitol under cylinder temperatures of 200-320OC. Distributions in the flow direction of higher-order structures such as a*-axis-oriented component fraction [ A * ] and crystalline orientation functions and distributions in the thickness direction of higherorder structures such as crystallinity, P-crystal content, the degree of b-axis orientation to the thickness direction, [ A * 1, and crystalline orientation functions were studied. These higher-order structures are inhomogeneous in the flow and thickness directions, which strongly influences the product properties such as mechanical and thermal properties.