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首页> 外文会议>Society of Plastics Engnieers annual technical conference >THE EFFECT OF BLEND COMPOSITION AND DRAW RATIO ON THE THERMAL, OPTICAL, AND MECHANICAL PROPERTIES IN PET/PEI FILMS
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THE EFFECT OF BLEND COMPOSITION AND DRAW RATIO ON THE THERMAL, OPTICAL, AND MECHANICAL PROPERTIES IN PET/PEI FILMS

机译：混合组合物和拉伸比对PET / PEI薄膜热，光学和机械性能的影响

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Thermal, optical, and mechanical properties of uniaxially stretched blends of PET/PEI films as a function of draw ratio were investigated. PET/PEI blends of compositions 0-30% PEI were prepared in a twin screw extruder, and cast into transparent amorphous films on a chilled roll fed by a single screw extruder. The DSC data showed a rapid rise in crystallinity followed by a much slower increase directly after the films reached the stress hardening point. The addition of PEI was found to hinder the formation of the crystalline lattice of PET and once formed, the crystallites were highly distorted. Also, PEI caused the onset of stress hardening to move to lower draw ratios. However, this influence on the stress-strain curves was not as a result of increased strain crystallizability but perhaps formation of a network that accelerated stress hardening in the presence of stiff and bulky molecules. This result clearly suggests that one can produce "self leveled" films at lower draw ratios by the addition of a small amount of PEI.
机译：研究了PET / PEI膜的单轴拉伸混合物的热，光学和力学性能作为拉伸比的函数。在双螺杆挤出机中制备组合物0-30％PEI的PET / PEI混合物，并在通过单螺杆挤出机供给的冷却辊上浇铸成透明的无定形膜。 DSC数据显示结晶性快速上升，然后在薄膜达到应力硬化点后直接较慢增加。发现添加PEI妨碍了PET结晶晶格的形成，并且一旦形成，微晶非常扭曲。此外，PEI导致应力硬化的发作以移动到较低的拉伸比率。然而，这种对应力 - 应变曲线的影响不是由于菌株结晶性增加，但也许形成在刚性和笨重的分子存在下加速压力硬化的网络。该结果清楚地表明，通过添加少量PEI，可以在较低的拉伸比下产生“自水位”薄膜。

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