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引用次数: 0
摘要
聚酰胺 4(PA4)是一种内酰胺基脂肪族合成聚合物,具有良好的性能和可生物降解性。本研究采用干法纺丝和热拉伸工艺制作了取向聚酰胺 4 纤维。根据拉伸应力导致的 X 射线衍射峰值移动,评估了 PA4 纤维结晶区在平行于链轴方向上的弹性模量(El)。在经向 004 反射和 0010 反射中,PA4 的表观 El 值分别为 67 GPa 和 119 GPa。造成 El 值不同的原因是,根据 Laue 因子,外加应力使 PA4 的晶粒尺寸减小,导致 004 反射峰向低角度移动。相比之下,0010 反射峰受到的影响较小,因此从 0010 反射峰得到的 119 GPa El 值被认为是一个可靠的值。观察到的 PA4 El 值远远低于假设 PA4 骨架为完全扩展的平面人字形的计算值。因此,较低的 El 值是由于在其他聚酰胺中观察到的完全伸展构象的高度收缩(-1.9%)造成的。
Microstructure and Crystal Modulus of Polyamide 4 α-form in the Direction Parallel to the Chain Axis
Polyamide 4 (PA4) is a lactam-based aliphatic synthetic polymer with promising properties and admirable biodegradability. In this study, oriented PA4 fibers were fabricated by dry spinning followed by thermal drawing. Elastic modulus (El) of the crystalline regions (crystal modulus) of PA4 fibers in the direction parallel to the chain axis was evaluated from the X-ray diffraction peak shift owing to the tensile stress. The apparent El value of PA4 is 67 GPa for meridional 004 reflection and 119 GPa for 0010 reflection, respectively. The reason for the different El is that the decrease of crystallite size of PA4 by the applied stress brought extra shifts of 004 reflection peak to lower angle based on the Laue factor. In contrast, 0010 reflection peak received less effects from this effect, and the El value of 119 GPa obtained from 0010 reflection was considered to be a reliable value. The observed El value of PA4 is much lower than the calculated values assuming fully extended planar zigzag skeleton for PA4. Thus the low El value is attributed to the highly contraction (-1.9%) from the fully extended conformation as observed for another polyamides.
期刊介绍:
Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics.
The main scope is covered but not limited to the following core areas:
Polymer Materials
Nanocomposites and hybrid nanomaterials
Polymer blends, films, fibres, networks and porous materials
Physical Characterization
Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films
Polymer Engineering
Advanced multiscale processing methods
Polymer Synthesis, Modification and Self-assembly
Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization
Technological Applications
Polymers for energy generation and storage
Polymer membranes for separation technology
Polymers for opto- and microelectronics.