Skip to content
BY 4.0 license Open Access Published by De Gruyter August 1, 2019

Effect of Annealing Temperature on PP Microporous Membranes Obtained by a Melt-Extrusion-Stretching Method

Z.-Y. Liu , X.-T. Wu , J. Yan , W. Yang and M.-B. Yang


Isotactic polypropylene (iPP) precursor film with highly oriented lamellar structure was produced through a melt extrusion-annealing-uniaxial stretching (MAUS) process. The precursor films were annealed at various temperatures and the structure evolution of precursor films during various annealing temperatures and the pore formation of the annealed film during stretching were investigated. During annealing, recrystallized lamellar structure was formed to obtain “core-shell sandwich” structure. The thickness of newly formed lamellae increased with annealing temperature, which improved the ability of slipping resistance of the original lamellar structure during stretching. As the annealing temperature of precursor film increased, the micropore shape and diameter of the final membranes became more uniform. The porosity of the microporous membranes increased with increasing annealing temperature.

*Correspondence address, Mail address: Zhengying Liu, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, PRC, E-mail:


Arora, P., Zhang, Z. M., “Battery Separators”, Chem. Rev., 104, 44194462 (2004) 10.1021/cr020738uSearch in Google Scholar PubMed

Bierenbaum, H. S., Daley, L. R., Zimmerman, D. and Hay, I. L., U.S. Patent 3843 761 (1974)Search in Google Scholar

Cai, Q., Xu, R. J., Wu, S. Q., Chen, C. B., Mo, H. B., Lei, C. H., Li, L. B. and Li, Z. H., “Influence of Annealing Temperature on the Lamellar and Connecting Bridge Structure of Stretched Polypropylene Microporous Membrane”, Polym. Int., 64, 446452 (2015) 10.1002/pi.4828Search in Google Scholar

Cheng, X. Q., Wang, Z. X., Jiang, X., Li, T. X., Lau, C. H., Guo, Z. H., Ma, J. and Shao, L., “Towards Sustainable Ultrafast Molecular-Separation Membranes: From Conventional Polymer to Emerging Materials”, Prog. Mater. Sci., 92, 258283 (2018) 10.1016/j.pmatsci.2017.10.006Search in Google Scholar

Clark, E. J., Hoffman, J. D., “Regime III Crystallization in Polypropylene”, Macromolecules, 17, 878885 (1984) 10.1021/ma00134a058Search in Google Scholar

DingZ. T., Bao, R. Y., Zhao, B., Yan, J., Liu, Z. Y. and Yang, M. B., “Effects of Annealing on Structure and Deformation Mechanism of Isotactic Ppolypropylene Film with Row-Nucleated Lamellar Structure”, J. Appl. Polym. Sci., 130, 16591666 (2013) 10.1002/app.39351Search in Google Scholar

Ding, Z. T., Liu, Z. Y., Feng, J. M., Yang, W. and Yang, M. B., “Effect of the Content of High Molecular Weight Component on PP Microporous Membranes Obtained by Melt-Extrusion-Stretching Method”, Acta Polymerica Sinica, 462468 (2012) 10.3724/SP.J.1105.2012.11324Search in Google Scholar

Himma, N. F., Anisah, S., Prasetya, N. and WentenI. G., “Advances in Preparation, Modification, and Application of Polypropylene Membrane”, J. Polym. Eng., 36, 329362 (2016) 10.1515/polyeng-2015-0112Search in Google Scholar

Lee, S. Y., Park, S. Y. and Song, H. S., “Lamellar Crystalline Structure of Hard Elastic HDPE Films and its Influence on Microporous Membrane Formation”, Polymer, 47, 35403547 (2006) 10.1016/j.polymer.2006.03.070Search in Google Scholar

Li, Y. J., Pu, H. T. and Wei, Y. L., “Polypropylene/Polyethylene Multilayer Separators with Enhanced Thermal Stability for Lithium-Ion Battery via Multilayer Coextrusion”, Electrochim. Acta, 264, 140149 (2018) 10.1016/j.electacta.2018.01.114Search in Google Scholar

Lin, Y. F., Li, X. Y., Meng, L. P., Chen, X. W., Lv, F., Zhang, Q. L., Zhang, R. and Li, L. B., “Structural Evolution of Hard-Elastic Isotactic Polypropylene Film during Uniaxial Tensile Deformation: The Effect of Temperature”, Macromolecules, 51, 26902705 (2018) 10.1021/acs.macromol.8b00255Search in Google Scholar

Liu, J., Ding, Z. T., Liu, Z. Y., Feng, J. M., Yang, W. and Yang, M. B., “Effect of Roller Rates and Temperatures on the Structure of HDPE Stretched Microporous Membranes and Lamellae”, Acta Polymerica Sinica, 1278–1283 (2011) 10.3724/SP.J.1105.2011.10328Search in Google Scholar

Rosova, E. Y., Karpov, E. A., Lavrentiev, V. K. and Elyashevich, G. K., “The Effect of Annealing on Structural Rearrangements and Mechanical Properties of Hard Elastic Polyethylene”, PPS-12 Annual Meeting, Sorrento, Italy, 297 (1996)Search in Google Scholar

Sadeghi, F., Ajji, A. and Carreau, P. J., “Analysis of Microporous Membranes Obtained from Polypropylene Films by Stretching”, J. Membr. Sci., 292, 6271 (2007) 10.1016/j.memsci.2007.01.023Search in Google Scholar

Saffar, A., Ajji, A., Carreau, P. J. and Kamal, M. R., “The Impact of New Crystalline Lamellae Formation during Annealing on the Properties of Polypropylene Based Films and Membranes”, Polymer, 55, 31563167 (2014) 10.1016/j.polymer.2014.05.017Search in Google Scholar

Tabatabaei, S. H., Carreau, P. J. and Ajji, A., “Microporous Membranes Obtained from Polypropylene Blend Films by Stretching”, J. Membr. Sci., 325, 772782 (2008) 10.1016/j.memsci.2008.09.001Search in Google Scholar

Tabatabaei, S. H., Carreau, P. J. and Ajji, A., “Effect of Processing on the Crystalline Orientation, Morphology, and Mechanical Properties of Polypropylene Cast Films and Microporous Membrane Formation”, Polymer, 50, 42284240 (2009) 10.1016/j.polymer.2009.06.071Search in Google Scholar

Tabatabaei, S. H., Carreau, P. J. and Ajji, A., “Microporous Membranes Obtained from PP/HDPE Multilayer Films by Stretching”, J. Membr. Sci., 345, 148159 (2009) 10.1016/j.memsci.2009.08.038Search in Google Scholar

Valles-Lluch, A., Contat-Rodrigo, L. and Ribes-Greus, A., “Differential Scanning Calorimetry Studies on High-and Low-Density Annealed and Irradiated Polyethylenes: Influence of Aging”, J. Appl. Polym. Sci., 89, 32603271 (2003) 10.1002/app.12479Search in Google Scholar

Wang, S., Saffar, A., Ajji, A., Wu, H. and Guo, S. Y., “Fabrication of Microporous Membranes from Melt Extruded Polypropylene Precursor Films via Stretching: Effect of Annealing”, Chin. J. Polym. Sci., 33, 10281037 (2015) 10.1007/s10118-015-1643-xSearch in Google Scholar

Włochowicz, A., Eder, M., “Distribution of Lamella Thicknesses in Isothermally Crystallized Polypropylene and Polyethylene by Differential Scanning Calorimetry”, Polymer, 25, 12681270 (1984) 10.1016/0032-3861(84)90374-4Search in Google Scholar

Xiong, B. J., Chen, R., Zeng, F. X. Y., Kang, J. and Men, Y. F., “Thermal Shrinkage and Microscopic Shutdown Mechanism of Polypropylene Separator for Lithium-ion Battery: In-situ Ultra-Small Angle X-Ray Scattering Study”, J. Membr. Sci., 545, 213220 (2018) 10.1016/j.memsci.2017.10.001Search in Google Scholar

Xu, R. Z., Zeng, S., Wang, J. T., Kang, J., Xiang, M. and Yang, F., “Impact of Different Die Draw Ratio on Crystalline and Oriented Properties of Polypropylene Cast Films and Annealed Films”, J. Polym. Res., 25, 142 (2018) 10.1007/s10965-018-1534-2Search in Google Scholar

Xu, R. J., Chen, X. D., Xie, J. Y., Cai, Q. and Lei, C. H., “Influence of Melt-Draw Ratio on the Crystalline Structure and Properties of Polypropylene Cast Film and Stretched Microporous Membrane”, Ind. Eng. Chem. Res., 54, 29912999 (2015) 10.1021/acs.iecr.5b00215Search in Google Scholar

Received: 2018-10-17
Accepted: 2019-05-12
Published Online: 2019-08-01
Published in Print: 2019-08-13

© 2019, Carl Hanser Verlag, Munich

This work is licensed under the Creative Commons Attribution 4.0 International License.

Downloaded on 1.2.2023 from
Scroll Up Arrow