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Formation of the Gamma Crystalline Phase in High Melt Flow iPP and its Impact on Mechanical Properties

IP.com Disclosure Number: IPCOM000249406D
Publication Date: 2017-Feb-23
Document File: 7 page(s) / 346K

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The IP.com Prior Art Database

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Lanya Cheng: AUTHOR [+7]


The objective of this work was to explore the formation of γ crystalline phase in alpha (α) or beta (β) nucleated Ziegler-Natta (ZN)-based high melt flow isotactic polypropylene (iPP). ExxonMobil PP9999ss (MFR 65, ASTM D1238 230°C, 2.16 kg) was mixed with commercial nucleating agents (NAs), then samples were extruded, pelletized and injection molded to perform crystal characterization using wide-angle X-ray diffraction (WAXD). The injection molded specimens exhibited an apparent retention of γ crystal in nucleated PP9999ss, especially nucleated by alpha nucleating agents (α-NAs). The coexistence of γ phase along with α phase was unexpected. Higher content of γ crystallinity induced by α-NAs offers larger contribution to stiffness property in PP9999ss.

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Formation of the Gamma Crystalline Phase in High Melt Flow iPP and its   Impact on Mechanical Properties 

  Lanya Cheng, Ling Ge, Alexander Norman, Yingying Sun, Sudhin Datta, Mark Davis

ExxonMobil Chemical Company, 5200 Bayway Drive, Baytown, Texas 77520 


Abstract: The objective of this work was to explore the formation of γ crystalline phase in alpha (α) or  beta (β) nucleated Ziegler‐Natta (ZN)‐based high melt flow isotactic polypropylene (iPP). ExxonMobil  PP9999ss (MFR 65, ASTM D1238 230°C, 2.16 kg) was mixed with commercial nucleating agents (NAs),  then samples were extruded, pelletized and injection molded to perform crystal characterization using  wide‐angle X‐ray diffraction (WAXD). The injection molded specimens exhibited an apparent retention  of  γ  crystal  in  nucleated  PP9999ss,  especially  nucleated  by  alpha  nucleating  agents  (α‐NAs).  The  coexistence of γ phase along with α phase was unexpected. Higher content of γ crystallinity induced by  α‐NAs offers larger contribut...