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Self‐nucleation behaviors of olefinic blocky copolymer/montmorillonite nanocomposites with collapsed and intercalated clay layers
Author(s) -
Tong ZaiZai,
Huang Jie,
Zhou Bing,
Xu JunTing,
Fan ZhiQiang
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41771
Subject(s) - nucleation , montmorillonite , nanocomposite , crystallization , materials science , annealing (glass) , copolymer , polymer , polymer chemistry , chemical engineering , composite material , crystallography , chemistry , organic chemistry , engineering
The self‐nucleation behavior of olefinic blocky copolymer (OBC) / organically modified montmorillonite (OMMT) nanocomposites with a novel collapsed clay structure (c‐OMMT) was studied and compared with that of the nanocomposites with an intercalated clay structure (OBC/i‐OMMT). Their behaviors appear different in three temperature domains, Domain I (D I ) in which the polymer is completely melted and only the heterogeneous nuclei are present, Domain II (D II ) in which only self‐nucleation occurs and Domain III (D III ) where both self‐nucleation and annealing take place. As the OMMT loading increases, the boundary temperature of D I and D II ( T I → II ) shifts to lower temperature and D II becomes narrower. For the OBC/c‐OMMT nanocomposites, the T I → II or T I → III (the boundary temperature of D I and D III ) can be lower than the end melting temperature ( T m end) and leads to appearance of a subdomain of D I , D I ′, in which the self‐nuclei of un‐melted fragmental crystals exist but the following crystallization is still initiated by c‐OMMT. D II may even disappear at high c‐OMMT loadings. By contrast, the T I → II of the OBC/i‐OMMT nanocomposites is always approximate to or higher than theT m end. D II does not disappear and no D I ′ is observed for the OBC/i‐OMMT nanocomposites. The nucleation efficiency of c‐OMMT is also evidently higher than that of i‐OMMT. These results verify that the c‐OMMT has stronger nucleation ability than i‐OMMT at the same OMMT loading. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41771.