Premium
Structures and properties of injection moldings of crystallization nucleator‐added polypropylenes. II. Distribution of higher‐order structures
Author(s) -
Fujiyama Mitsuyoshi,
Wakino Tetsuo
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070421013
Subject(s) - materials science , crystallinity , talc , composite material , crystallization , melt flow index , flexural strength , crystal (programming language) , polypropylene , chemical engineering , polymer , engineering , copolymer , computer science , programming language
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 200–320°C. 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 higher‐order structures such as crystallinity, β‐crystal content, the degree of b ‐axis orientation to the thickness direction, [ A * ], 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.