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Self‐nucleation–induced nonisothermal crystallization of nylon 6 from the melt
Author(s) -
Li Huizhen,
Guo Ran,
Liu Yuhai,
Liu Shaoxuan,
Proniewicz Edyta,
Proniewicz Leonard M.,
Zhao Ying,
Xu Yizhuang,
Wu Jinguang
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.42413
Subject(s) - crystallization , nylon 6 , nucleation , materials science , polarized light microscopy , optical microscope , lamella (surface anatomy) , atmospheric temperature range , polymer chemistry , chemical engineering , fourier transform infrared spectroscopy , composite material , crystallography , scanning electron microscope , polymer , chemistry , thermodynamics , optics , organic chemistry , physics , engineering
The effect of thermal treatment over a wide range of temperature (130–280°C) on the crystallization behavior of nylon 6 was studied by using DSC, FTIR, and polarized light microscope equipped with a hot stage. The crystallization and the subsequent melting behavior of the nylon 6 samples treated at different temperatures ( T s ) were classified into four types. When T s was higher than 236°C or lower than 213°C, the crystallization behavior of nylon 6 was insensitive to the variation of T s . When T s was in the range of 213–235°C, the crystallization behavior was sensitive to the change of T s . The polarized light microscopic experiments have demonstrated that a large amount of tiny ordered nylon 6 segments/cluster persisted when nylon 6 film are heated to 231°C. Consequently, the fastest crystallization speed was observed. As T s was between 214 and 223°C, both the T m and the Δ H m were higher than those of the nylon 6 samples treated at other temperature. The polarized light microscopic investigations have also demonstrated that molten nylon 6 crystallizes by using the un‐molten nylon 6 crystals as nucleation center at 220°C. Crystallization at higher temperature produces nylon 6 with thicker crystalline lamella. The above results are helpful for rational design of thermal treatment procedure to obtain nylon 6 with different crystalline features. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42413.