Study of structure and properties of polypropylene microporous membrane by hot stretching

Shuqiu, Wu; Lei, Caihong; Cai, Qi; Xu, Ruijie; Hu, Bing; Shi, Wei; Peng, Xinlong

doi:10.1007/s00289-014-1182-6

Cited by 26 publications

(16 citation statements)

References 16 publications

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“…The melting point of bridge crystals is 5 o C higher than that of main lamellae crystals. [40] Thus, a small shoulder peak (Peak 3) near 170 o C is attributed to the connecting bridge crystals, as shown in Figure 16. The exothermic peak in the nonreversing curve in Figure 17 is related to the recrystallized part.…”

Section: Tmdsc Of Stretched Films To Different Ratios At Room-temperamentioning

confidence: 91%

The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

Chen

Xie

et al. 2016

Polymer

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The room-temperature stretching process of polypropylene annealed film with rownucleated crystalline structure was studied by in-situ small-angle X-ray scattering (SAXS) setup and off-line wide-angle X-ray scattering (WAXS), temperature-modulated differential scanning calorimetry (TMDSC) and stress-strain curves testing. The formation process of initial connecting bridges and pores was clarified. For the annealed film, except for the initial lamellae structure, the recrystallized part formed by the melting and crystallization of imperfect crystals during annealing, tie chains connecting the lamellae structure among the amorphous region, secondary crystals from the crystallization of tie chains during annealing and daughter crystals from the special cross-hatched crystalline structure of PP coexist. It was found that 10 % stretching lead to the pronounced increase of long period and the appearance of a few initial connecting bridges. The stretching of daughter crystal and recrystallized part contributed to the formation of initial bridges. At stretching ratio of 30 %, uniform distributed connecting bridges were observed and the stretched film showed maximum structure periodicity. At this stretching ratio, except for the stretching of daughter crystal, the stretching of tie chains and secondary crystals within the amorphous region lead to the formation of more connecting bridges. At higher stretching ratios into the strain-hardening region and beyond the second yield point, except for the stretching of the above mentioned crystalline

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Section: Tmdsc Of Stretched Films To Different Ratios At Room-temperamentioning

confidence: 91%

The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

Chen

Xie

et al. 2016

Polymer

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“…Usually, after being molten and extruded from extruder, high crystalline polymer (such as PE and PP) will be stretched in two steps: Firstly, cold stretching of the film nucleates micropores from amorphous region of the polymer, and afterwards, hot stretching is carefully conducted to increase and finalize the pore size with consideration of thermal or mechanical properties of the precursor film such as melting point, crystallinity and tensile strength etc. Membranes produced from these procedures display an islandic structure where crystalline region is connected by fibers when observed using scanning electronic microscopy as shown in Figure 2.6 [38].…”

Section: Stretchingmentioning

confidence: 99%

Effect of PET support membrane thickness on water permeation behavior of thermally responsive PNIPAM-g-PET membranes

Sancaktar

2020

Journal of Membrane Science

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opportunity to work on this project, all the time he spent on discussion with me on the matter and solution to problems raised as well as his patience and encouragement manifested throughout this work. I would like to extend my gratitude to Dr. Nicole Zacharia for letting me use equipment in her lab. Gratitude is also given to all my group members, especially to Ankit Tiwari for his careful guidance and unceasing inspiration which helped me to think independently, Renuka Patil for her always reachable companion. Yu Zou, Ruofan Liu, Weicheng Sun Shangmin Li and Wenqi Li were helpful in the course of this project and thesis composing, thank you for being by my side when I need your precious knowledges and skills. To all my other friends in the University of Akron, such as Shifeng Huang, Yi Zhou and so on and friends from Church in Akron, such as Fengyu Yang, Grace Geng and Yanbo Pan, for their understanding and care for me, which encouraged me when I was in need of support and comfort. Last but not least, the remind and encouragement from my family in China, which are my parents, my aunt, my grandparents and my sister, are very important to me. I'd like to give thanks to all who helped, supported and encouraged me in the course of processing this work and writing this thesis. I love you all! vii 7.TABLE

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“…The effective processing parameters in dry‐stretching method including air cooling, roll temperature as well as the time and temperature chosen for annealing process . However, in particle stretching, the pores are formed at the interface of particles and matrix by hot stretching and there is no need to stretch the precursor film at low temperature . Semi‐crystalline polymers such as polyolefins are commonly used in stretching method .…”

Section: Introductionmentioning

confidence: 99%

Tailoring of thermal and mechanical properties of hollow glass bead‐filled polypropylene porous Films via stretching ratio and filler content

et al. 2018

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The momentous role of hollow glass bead (HGB) fillers to manipulate the thermal and mechanical properties of polymers has become an issue of significant interest. As regards, the scope of this work is oriented to manifest the interplay effects of HGB contents (average size of 60 μm) and uniaxial stretching ratios (100 and 200%) on HGB‐filled bimodal polypropylene (PP) films. SEM micrographs showed that at higher stretching ratio at about 120°C the pore formation was improved which was due to performance of smaller HGB particles. Also increasing the amount of HGBs could notably decrease the permeability of microporous composite films as a result of compaction effect. Moreover, an additional peak in the differential scanning calorimetry of composite films was the nucleating performance of smaller HGB particles. The yielding behavior of the precursor and porous PP samples prepared by hot stretching was analyzed by tensile testing. The results revealed that with the increase in the number of pores, strain softening was faded and eventually completely removed. Therefore, a ductile‐brittle transition occurred in the behavior of the polymer. POLYM. COMPOS., 40:2938–2945, 2019. © 2018 Society of Plastics Engineers

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Study of structure and properties of polypropylene microporous membrane by hot stretching

Cited by 26 publications

References 16 publications

The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

The study of room-temperature stretching of annealed polypropylene cast film with row-nucleated crystalline structure

Effect of PET support membrane thickness on water permeation behavior of thermally responsive PNIPAM-g-PET membranes

Tailoring of thermal and mechanical properties of hollow glass bead‐filled polypropylene porous Films via stretching ratio and filler content

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