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The effect of nucleating agents on the crystallization kinetics of polypropylene
Author(s) -
Dolgopolsky I.,
Silberman A.,
Kenig S.
Publication year - 1995
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1995.220061003
Subject(s) - crystallization , materials science , differential scanning calorimetry , polypropylene , nucleation , kinetics , polyethylene , chemical engineering , isothermal process , avrami equation , activation energy , polymer chemistry , thermodynamics , crystallization of polymers , composite material , chemistry , physics , quantum mechanics , engineering
Abstract Compositions of neat polyproylene (PP), PP–PE (polyethylene) blend and PP–PE–DBS (dibenzylidene sorbitol) were studied with respect to their crystallization kinetics by means of differential scanning calorimetry in isothermal mode. A modified Avrami equation was applied to obtain the crystallization parameters of PP, PP–PE and PP–PE–DBS. Optical and hot‐stage microscopy and dynamical analysis were used for structure determination. Experimental results have indicated that PE addition inhibits PP crystallization rate and acts as a plasticizer, while addition of DBS changes the crystallization kinetics. A detailed study of the DBS nucleation effects indicates that owing to the high surface energy, nuclei are formed during primary crystallization, leading to a fine PP crystalline structure and improved mechanical properties.