Effect of Machine Direction Orientation Conditions On Properties of Hdpe Films
Effect of Machine Direction Orientation Conditions On Properties of Hdpe Films
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DOI：
10.1177/8756087910369423
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发表时间：
2009-07
影响因子：
3.1
通讯作者：
S. H. Tabatabaei;L. Parent;P. Cigana;A. Ajji;P. Carreau
中科院分区：
文献类型：
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作者：
S. H. Tabatabaei;L. Parent;P. Cigana;A. Ajji;P. Carreau
在这项研究中，机器方向取向（MDO）的条件对高密度聚乙烯薄膜的结晶取向，形态和力学性能的影响进行了研究。MDO变量的研究是进料速度，拉伸温度，拉伸比（DR）以及退火温度。使用差示扫描量热法的晶体（球晶或原纤维）和结晶度的膜的类型被认为是。MDO工艺将膜结晶度提高了18%，熔融温度（Tm）提高了5°C。用傅里叶变换红外和广角X射线衍射测定了晶相取向。拉伸明显增加了晶体排列。杨氏模量随挤压温度和喂料速度的升高而降低，随退火温度的升高而升高。然而，直到DR = 6，杨氏模量随着拉伸比而降低，而超过DR = 6则增加。在拉伸时，沿纵向的抗撕裂性沿着显著降低，但沿法线方向的抗穿刺性沿着显著增加。最后，拉伸显著降低了膜的雾度，因此显著提高了透明度。
In this study, the effects of machine direction orientation (MDO) conditions on crystalline orientation, morphology, and mechanical performance of a high-density polyethylene film were investigated. The MDO variables studied were feed speed, stretching temperature, draw ratio (DR) as well as annealing temperature. The type of crystals (spherulites or fibrils) and crystallinity of the films were considered using differential scanning calorimetry. The MDO process increased the film crystallinity by 18% and melting temperature (Tm ) by 5°C. The crystalline phase orientation was measured using Fourier transform infrared and wide angle X-ray diffraction. Stretching noticeably increased the crystalline alignment. The Young’s modulus decreased with increasing extrusion temperature and feed speed and enhanced with rising annealing temperature. However, up to DR = 6, the Young’s modulus decreased with draw ratio whereas it increased beyond DR = 6. Upon drawing, the tear resistance along the machine direction decreased significantly, but the puncture resistance along the normal direction increased drastically. Finally, drawing lowered haze for the films dramatically, hence, improved the clarity significantly.