Citation: Zhong-bin Xu, Liang-yao Su, Peng-fei Wang, Mao Peng. Effect of Oscillatory Shear on the Mechanical Properties and Crystalline Morphology of Linear Low Density Polyethylene?[J]. Chinese Journal of Polymer Science, ;2015, 33(8): 1114-1124. doi: 10.1007/s10118-015-1663-6 shu

Effect of Oscillatory Shear on the Mechanical Properties and Crystalline Morphology of Linear Low Density Polyethylene?

1.
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
2.
Department of Polymer Sci &

Corresponding author: Mao Peng,
Received Date: 26 November 2014
Revised Date: 19 January 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 51373153 and 51073139), the Zhejiang Provincial Natural Science Foundation of China (No. LY13E030002) and the Zhejiang Leading Team of ST Innovation (No. 2011R50005).

In this study, effects of oscillatory shear with different frequencies (0-2.5 Hz) and amplitudes (0-20 mm) on the mechanical properties and crystalline morphology of linear low density polyethylene (LLDPE) were investigated. It was found that the mechanical properties of LLDPE are improved because of the more perfect crystalline structure when LLDPE crystallizes under low-frequency and small-amplitude (0.2 Hz/4 mm) oscillatory shear. The mechanical properties can be further improved by increasing either the frequency or the amplitude of oscillatory shear. The Young's modulus and tensile strength of LLDPE are improved by 27% and 20%, respectively, when the frequency is increased to 2.5 Hz and the amplitude is maintained at 4 mm; while the Young's modulus and tensile strength are improved by 49% and 47%, respectively, when the amplitude is increased to 20 mm and the frequency is remained as 0.2 Hz. The crystallinity and microstructure of LLDPE under different oscillatory shear conditions were investigated by using differential scanning calorimetry, wide angle X-ray diffraction and scanning electron microscopy to shed light on the mechanism for the improvement of mechanical properties.
- Oscillatory shear,
- Linear low density polyethylene,
- Shish-kebab,
- Mechanical property,
- Crystalline morphology
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沈阳化工大学材料科学与工程学院沈阳 110142