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A novel β‐nucleating agent for isotactic polypropylene
Author(s) -
Ma Yujie,
Xin Mingliang,
Xu Kai,
Chen Mingcai
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4357
Subject(s) - tacticity , crystallization , materials science , differential scanning calorimetry , nucleation , scanning electron microscope , isothermal process , optical microscope , polypropylene , polarized light microscopy , polymer chemistry , crystallography , chemical engineering , composite material , polymer , chemistry , polymerization , organic chemistry , optics , thermodynamics , physics , engineering
The nucleating ability of p ‐cyclohexylamide carboxybenzene (β‐ NA ) towards isotactic polypropylene ( iPP ) was investigated by differential scanning calorimetry, X‐ray diffraction, polarized optical microscopy and scanning electron microscopy. β‐ NA is identified to have dual nucleating ability for α‐ iPP and β‐ iPP under appropriate kinetic conditions. The formation of β‐ iPP is dependent on the content of β‐ NA . The content of β‐phase can reach as high as 96.96% with the addition of only 0.05 wt% β‐ NA . Under non‐isothermal crystallization the content of β‐ iPP increases with increasing cooling rate. The maximum β‐crystal content is obtained at a cooling rate of 40 °C min –1 . The supermolecular structure of the β‐ iPP is identified as a leaf‐like transcrystalline structure with an ordered lamellae arrangement perpendicular to the special surface of β‐ NA . Under isothermal crystallization β‐crystals can be formed in the temperature range 80–140 °C. The content of β‐crystals reaches its maximum value at a crystallization temperature of 130 °C. © 2012 Society of Chemical Industry