Enhancement of drawdown force in polypropylene containing nucleating agent

ABSTRACT The effect of the nucleation efficiency of three commercial nucleating agents, such as 1,3:2,4‐bis(3,4‐dimethylbenzylidene)sorbitol (DMDBS), sodium 2,2′‐methylene‐bis‐(4,6‐di‐tert‐butylphenyl)phosphate (SMBP), and magnesium silicate (talc), on the melt‐stretching performance of isotactic po...

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Bibliographic Details
Published inJournal of applied polymer science Vol. 136; no. 7
Main Authors Phulkerd, Panitha, Nakabayashi, Takehiro, Iwasaki, Shohei, Yamaguchi, Masayuki
Format Journal Article
LanguageEnglish
Published Hoboken, USA John Wiley & Sons, Inc 15.02.2019
Wiley Subscription Services, Inc
Subjects
Crystal structure
Crystallization
Magnesium silicates
Materials science
Nanofibers
Nucleation
Polymers
Polypropylene
Reagents
Sorbitol
Stretching
Talc
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Summary:ABSTRACT The effect of the nucleation efficiency of three commercial nucleating agents, such as 1,3:2,4‐bis(3,4‐dimethylbenzylidene)sorbitol (DMDBS), sodium 2,2′‐methylene‐bis‐(4,6‐di‐tert‐butylphenyl)phosphate (SMBP), and magnesium silicate (talc), on the melt‐stretching performance of isotactic polypropylene (PP) is studied. It is found that the addition of 0.5 wt % of a nucleating agent enhances the crystallization temperature and that effect is pronounced for DMDBS and SMBP. Furthermore, DMDBS is more efficient than the other tested nucleating agents in enhancing the drawdown force, defined as a force required for stretching a molten strand. Nanofibers of DMDBS, which show significant alignment in the flow direction, are responsible for the rapid crystallization of PP in the flow field leading to an increase of drawdown force. The stretched strand shows a highly oriented structure in which the α‐form crystals orient to the flow direction. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47295.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.47295