Abstract
In this work, polyamide 1010 (PA1010) films were prepared by melt-quenching. A wide-angle X-ray diffractometer (WAXD) with a thermal stretching stage was used to investigate the structure transformation, crystallinity and degree of orientation in the course of simultaneous thermally stretched PA1010. The crystallinity increased along with the increase of draw ratio and then decreased as the draw ratio was over 2.00 times—which the maximum value reached when the draw ratio was about 2.00 times. The degree of orientation of γ-PA1010 was much greater at higher temperature than room temperature (RT); the difference gradually became weaker with the increase of draw ratio. There was a linear relationship between the draw ratios and tensile force at higher temperatures, and the tensile force increased with the increase of draw ratios. The tensile force may induce crystallization and promote orientation in the course of simultaneous thermally stretched PA1010. These phenomena are beneficial to understand the structure-processing-performance relationship and provide some theoretical basis for the processing and production.
Highlights
Polyamide (PA), an important semi-crystalline polymer, is used in many fields, such as military equipment [1], aerospace materials [2], insulation and textile materials [3,4], due to its good mechanical, thermal and chemical properties [5,6]
We et al [39] have reported the structural evolution of polyamide 1010 (PA1010) with the α-crystal under the simultaneous thermal stretching and confirmed the tensile force and higher annealing temperature could affect the crystallinity and degree of orientation
The difference the degree of between the molecular chains draw of the ratio polyamide, the molecular segments are easilyoforiented during orientation gradually becomes weaker as the draw ratios increases, it is always greater at higher the stretching process
Summary
Polyamide (PA), an important semi-crystalline polymer, is used in many fields, such as military equipment [1], aerospace materials [2], insulation and textile materials [3,4], due to its good mechanical, thermal and chemical properties [5,6]. The α-crystal of PA1010 is a research hot topic and has been concerned widely because α-crystal could transform to γ-crystal structure when the temperature is over 100 ◦ C. Wang et al [38] have reported structural changes of PA1010 when PA1010 was stretched at room temperature. We et al [39] have reported the structural evolution of PA1010 with the α-crystal under the simultaneous thermal stretching and confirmed the tensile force and higher annealing temperature could affect the crystallinity and degree of orientation. Many researchers have known the reports on the crystal formation of PA1010 with the α-crystal, the researches about the dynamic structural evolution and properties of PA1010 with the γ-crystal under the simultaneous thermal stretching are rarely reported, especially for the study on the orientation. The effects of the higher annealing temperatures and tensile force on structure evolution, crystallinity and orientation of γ-PA1010 were investigated
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