Understanding the effects of nucleating agent concentration on the polymorphic behavior of β-nucleated isotactic polypropylene with different melt structures
作者： Jian Kang , Zhengfang Chen , Feng Yang , Jinyao Chen , Ya Cao
DOI: 10.1007/S00396-015-3605-9
关键词:
摘要: To elucidate the synergetic effect in enhancing β- crystallization between β-nucleating agent (β-NA) and or- dered structures of isotactic polypropylene (iPP), i.e., ordered structure (OSE), this study, role β-NA concen- tration (Cβ-NA) was studied by differential scanning calorim- etry (DSC) in-situ small-angle X-ray scattering (in-situ SAXS). Results showed that Cβ-NA a determining factor OSE: Cβ-NA<0.01 wt% too low to induce while Cβ-NA≥0.09 saturated concentration, none them can OSE; only when Cβ-NA=0.01-0.08 (i.e., unsaturated concentration) OSE take place. There existed competitive relationship enhancement β-phase conventional β-nucleation β-NA. Moreover, SAXS re- vealed at Tf=190 °C (around upper limiting temperature for occurrence OSE), different, geo- metric shapes iPP melts were quite different from each other. The involved mechanism proposed.
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