Structure of polyamide 6/poly(ethylene terephthalate) blends under high cooling rate and shear stress and their moisture-sensitive properties. (26th August 2020)

• Record Type: Journal Article
• Authors: Ma, Guo-Qi; Yang, Hao; Li, Lei; Sun, Zhao-Bo; Miao, Xia-Ran; Bian, Feng-Gang; Xu, Jia-Zhuang; Zhong, Gan-Ji; Gao, Xue-Qin; Li, Zhong-Ming
• Is Part Of: Polymer. Volume 203(2020)
• Publication Date: 2020-08-26
• Subjects: Moisture-sensitive properties -- Polyamide 6 -- Structure; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2020.122817
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Polyamide 6 (PA6) with low moisture-sensitivity is realized by blending with poly(ethylene terephthalate) (PET), the crystal structure and morphology formed under high cooling rate and shear stress are also investigated. A pronounced reduction in the maximum water content from 9.7 to 5.6 wt% accompanying the variation of the diffusion coefficient from 1.2 × 10 −6 to 5.2 × 10 −7 mm 2 /s with the increasing of PET content is achieved. The dielectric constant decreases from 12.3 to 6.2 (@10 3 Hz) and the dielectric loss decreases from 0.25 to 0.13 (@10 3 Hz) with the increasing of PET content. The structural characterization confirms that the hydrogen-bonding interactions between PA6 and PET play a major role in the reduction of moisture-sensitivity of PA6 as well as that the evolution of the polymorphism of PA6 that the high shear stress facilitates the formation of α-form while the high cooling rate promotes the generation of γ-form. Graphical abstract: Image 1 Highlights: The moisture-sensitivity of polyamide 6 is significantly reduced. Hydrogen-bonding interactions play a crucial role in the low moisture-sensitivity. The properties of the blends are well preserved under exposure of water. The structure of the blends under high cooling rate and shear stress is revealed.