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

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 &

通讯作者: Mao Peng,

基金项目:
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).

摘要: 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.

关键词:

English

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
Available Online: 05 August 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).

Abstract: 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.

Key words:

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

通讯作者: Mao Peng,

English

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

Corresponding author: Mao Peng,

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

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

通讯作者: Mao Peng,

English

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

Corresponding author: Mao Peng,

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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