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首页> 外文期刊>Journal of Applied Polymer Science >Biaxial orientation behavior of polystyrene: Orientation and properties
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Biaxial orientation behavior of polystyrene: Orientation and properties

机译：聚苯乙烯的双轴取向行为：取向和性能

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Square sheets of extrusion grade polystyrene (PS) were biaxially stretched using a laboratory biaxial stretcher. The effects of process parameters such as stretch ratio, drawing sequence, drawing speed, and temperature were studied. Birefringence, mechanical properties, and thermal shrinkage of the stretched sheets were the focus of this study. A high orientation was achieved at high stretch ratio, and orientations from uniaxial to equi-biaxial were obtained by controlling the relative magnitude of stretch ratio in machine (MD) and transverse (TD) directions. Stretching increased tensile strength and elongation at break significantly, which indicated an improvement in the toughness of the oriented PS sheets. Those properties were correlated with biaxial orientation factors: a rapid increase was observed for both tensile strength and elongation at break for birefringence levels above -0.005, and below, a plateau was observed. The shrinkage strain and stress were found to correlate well with the biaxial orientation factors. (C) 2003 Wiley Periodicals, Inc. [References: 25]
机译：使用实验室双轴拉伸机将挤出级聚苯乙烯（PS）的方形片材双轴拉伸。研究了拉伸比，拉伸顺序，拉伸速度和温度等工艺参数的影响。拉伸片材的双折射，机械性能和热收缩率是本研究的重点。在高拉伸比下实现了高取向，并且通过控制纵向（MD）和横向（TD）方向上拉伸比的相对大小，可以获得从单轴到等双轴的取向。拉伸显着提高了拉伸强度和断裂伸长率，这表明取向的PS片的韧性得到改善。这些性质与双轴取向因子相关：对于高于-0.005的双折射水平，观察到拉伸强度和断裂伸长率均迅速增加，而在低于此水平时，观察到平稳期。发现收缩应变和应力与双轴取向因子良好相关。 （C）2003 Wiley Periodicals，Inc. [参考：25]

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