Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing

Ling-pu Meng; Xiao-wei Chen; Yuan-fei Lin; Liang-bin Li

doi:10.1007/s10118-017-1965-y

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Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing

Papers | Updated：2021-02-18

- Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing
- Chinese Journal of Polymer Science Vol. 35, Issue 9, Pages: 1122-1131(2017)
- Affiliations：
  
  National Synchrotron Radiation Lab, Key Laboratory of Soft Matter Chemistry, Chinese Academy of Sciences, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  Liang-bin Li (李良彬), E-mail:lbli@ustc.edu.cn
- Funds：
- DOI：10.1007/s10118-017-1965-y
  CLC：
- Received：06 March 2017，
  
  Revised：2017-4-14，
  
  Accepted：20 April 2017，
  
  Published：05 September 2017
- Accepted：
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Ling-pu Meng, Xiao-wei Chen, Yuan-fei Lin, et al. Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing[J]. Chinese Journal of Polymer Science, 2017, 35(9): 1122-1131.
DOI：

Ling-pu Meng, Xiao-wei Chen, Yuan-fei Lin, et al. Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing[J]. Chinese Journal of Polymer Science, 2017, 35(9): 1122-1131. DOI： 10.1007/s10118-017-1965-y.

摘要

Abstract

Young's modulus of biaxially oriented polypropylene (BOPP) films prepared with homemade film stretcher was investigated

which can be used to indicate the softness of films. It was found that the modulus of films was decreased by about 69% as the content of polyethylene (PE) added into polypropylene (PP) reached 30%. Also

increasing draw temperature can induce lower stress level during stretching

which may lead to the formation of crystals with low orientation level and thus decreased modulus of films. Based on laboratory study

BOPP films produced on commercial line were studied by differential scanning calorimetry (DSC)

wide and small-angle X-ray scattering (WAXS

SAXS) with varying contents of PE. SAXS results show that the crystals are oriented in both machine direction (MD) and transverse direction (TD)

and the crystals are more oriented in TD than MD according to the WAXS results for all films. Also

the orientation parameter of crystal along TD increases from 0.68 to 0.83 as the contents of PE increase from 0% to 25%. Meanwhile

the modulus of films in MD declines with increase of PE contents generally

improving the film softness. Orientation of crystals is thus an effective structure parameter to adjust the film softness. The relationship of processing-structure-property is also established.

关键词

Keywords

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