Effects of cast extrusion line speed on the crystallinity of LLDPE stretch films
سال انتشار: 1399
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 172
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شناسه ملی سند علمی:
OGPC03_058
تاریخ نمایه سازی: 12 آبان 1400
چکیده مقاله:
Influence of line speed on the crystallinity of linear low density polyethylene (LLDPE) stretch films manufactured in a cast extrusion line was examined using differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). The multilayer LLDPE films were prepared at wide range of line speeds from ۲۰۰ to ۱۰۰۰ m/min. TheDSC results showed that there is an increase in the crystallinity of films at higher line speeds. Furthermore, evaluating melting endotherms indicated that the size of crystals was more uniform as the line speed increased. Crystallinity of films obtained from WAXD analysis also exhibited the similar trend of DSC results, though their values were different. In addition, there was a reduction in crystal size calculated from WAXD data upon increasing the line speed. The observed increase in crystallinity and decrease in crystal size was due to enhanced flow induced crystallization (FIC) as a result of greater shear stresses the polymer melt encountered at higher line speeds.
کلیدواژه ها:
نویسندگان
Ali Yadegari
Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, Bushehr ۷۵۱۶۹, Iran
Hoda Bayazian
Kunststofftechnik Paderborn (KTP), Paderborn University, Paderborn ۳۳۰۹۸, Germany
Volker Schöppner
Kunststofftechnik Paderborn (KTP), Paderborn University, Paderborn ۳۳۰۹۸, Germany