The crystallization kinetics of Nylon 6/6T and Nylon 66/6T copolymers

► As 6T % over 10mol%, all Nylon 6/6T transferred from α-form to γ-form. ► The Tm of Nylon 6/6T decreased as the amount of 6T increased. ► The crystallization rate k dropped greatly when the 6T in Nylon 6/6T is over 7mol%. ► Nylon 66/6T showed little crystalline difference as 6T % varied from 0 to 3...

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Bibliographic Details
Published in:Thermochimica acta 2013-03, Vol.555, p.37-45
Main Authors: Rwei, Syang-Peng, Tseng, Yu-Chi, Chiu, Kuei-Chen, Chang, Shu-Mei, Chen, Yu-Ming
Format: Article
Language:English
Subjects:
composite polymers
Copolymers
Crystallization
Crystallization rate
Crystals
Differential scanning calorimetry
Equilibrium melting point
Isomorphous
melting point
Melting points
nylon
Nylon 6
Nylon 6/6T
Nylon 66
Nylon 66/6T
polymerization
Terephthalic acid
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Summary:► As 6T % over 10mol%, all Nylon 6/6T transferred from α-form to γ-form. ► The Tm of Nylon 6/6T decreased as the amount of 6T increased. ► The crystallization rate k dropped greatly when the 6T in Nylon 6/6T is over 7mol%. ► Nylon 66/6T showed little crystalline difference as 6T % varied from 0 to 30mol%. ► The Tm of Nylon 66/6T remained constant, proving Nylon 66/6T is isomorphous. This work incorporated hexamethylene diamine and terephthalic acid, namely 6T, into typical polymerization processes of Nylon 6 and Nylon 66 to form Nylon 6/6T and Nylon 66/6T copolymers, respectively. The WAXD results showed that as the amount of 6T increased to 10mol%, all of the Nylon 6/6T copolymers transferred from α-form to γ-form. The DSC measurement revealed that the equilibrium melting point of Nylon 6/6T decreased as the amount of 6T increased. Moreover, the crystallization rate k decreased with the 6T content in Nylon 6/6T copolymers, and dropped greatly when the addition of 6T increased over 7mol%. In contrast, due to the similar molecular chain lengths of Nylon 66 and 6T, the WAXD results of Nylon 66/6T exhibited little crystal difference as the addition of 6T varied from 0 to 30mol%. The equilibrium melting point of Nylon 66/6T remained constant, proving that Nylon 66/6T is isomorphous.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2012.12.026