Synthesis and properties of poly(ethylene terephthalate) modified with a small amount of 1,10-decanediamine and hydrogen
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Synthesis and properties of poly(ethylene terephthalate) modified with a small amount of 1,10decanediamine and hydrogen bonds Hongwei Gao1, Huihui Liu2, Jinmei He1,*
, and Yongping Bai1,3,*
1
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, People’s Republic of China 2 Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621000, Sichuan, People’s Republic of China 3 Wuxi HIT New Material Research Institute CO., LTD, Wuxi 214100, Jiangsu, People’s Republic of China
Received: 13 September 2020
ABSTRACT
Accepted: 17 November 2020
Linear 1,10-decanediamine was chosen as a modified monomer to prepare modified poly(ethylene terephthalate) (PET) with a low content of amide bonds through two different synthetic methods. To evaluate the effect of amide bonds on the properties of poly(ester amide) analogs (PETAs), the performance of this new type of PET was compared with 1,10-decanediol-modified PET as a control group. The formation of hydrogen bonds in the PETAs was confirmed, and the stability of hydrogen-bonding interactions based on the low content of amide bonds at high temperature was discussed. Interestingly, physical cross-linking networks formed by hydrogen-bonding interactions improved the thermal stability, rheology, and mechanical properties of the PETAs. The crystallization properties were studied in depth by a series of tests, the results of which illustrated that the low content of amide bonds acted as a critical crystallization accelerator in the PETAs. A feasible strategy to prepare high-performance PET, which may be used as a packaging material, was introduced in this work.
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Springer Science+Business
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Handling Editor: Gregory Rutledge.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05590-7
J Mater Sci
GRAPHICAL ABSTRACT
Introduction Poly(ethylene terephthalate) (PET) has been widely used in daily life and industrial applications for decades since its advent in 1941 [1–4]. Constantly improving the performance of PET from all aspects, such as increasing its crystallization rate [5–7], improving its optical performance [8, 9], flame retardancy and anti-dripping properties [10, 11], gas barrier performance [12, 13], and mechanical properties [14–17], to meet the needs of products is the ultimate pursuit of researchers. An extremely effective approach to improve its properties is to introduce amide bonds into PET. Blending PET with polyamides (PAs) is a commonly used method to modify PET with amide bonds [18–21]. It has been suggested that these PET/PAs blends possess a high degree of crystallinity [22], good mechanical and thermal properties [23, 24], and good gas barrier performance [12]. However, blends of PET and PAs are unstable under shear stress because the two polymers are not very compatible. Inhomogeneous blends are produced, if no compatibilizers are applied. According to the research conducted by
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