Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing
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Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing
Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing
Chinese Journal of Polymer Science2017年35卷第9期 页码:1122-1131
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:
This work was financially supported by the National Natural Science Foundation of China(51325301);This work was financially supported by the National Natural Science Foundation of China(51227801)
Ling-pu Meng, Xiao-wei Chen, Yuan-fei Lin, 等. Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing[J]. Chinese Journal of Polymer Science, 2017,35(9):1122-1131.
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.
Ling-pu Meng, Xiao-wei Chen, Yuan-fei Lin, 等. 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.
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.
Improving the Softness of BOPP Films:From Laboratory Investigation to Industrial Processing
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.
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references
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