Polypropylene separator coated with a thin layer of poly(lithium acrylate‐<i>co</i>‐butyl acrylate) for high‐performance lithium‐ion batteries

Polypropylene is used in the textile industry in the manufacturing of plastic yarns, tapes, etc., but its low tensile strength and Young's modulus limits its associated applications. Composites of polypropylene with reinforcement of CaCO3 and rice husk ash were processed by compression molding. Bimodal porosity in rice husk ash particles has shown an improved interfacial anchoring effect via capillary effect resulting in enhanced mechanical properties, whereas such an effect is not observed with CaCO3 reinforcement in polypropylene matrix. On reinforcement with 10 wt % of each of rice husk ash and CaCO3, thermal decomposition temperature of polypropylene (333.3 °C) shifted to higher value of 415.9 °C and polypropylene Young's modulus (749.5 MPa) increased to 789.5 MPa (by 5.3%), but tensile strength decreased from 23.5 to 21.2 MPa (by 2.3 MPa only). The isolated contribution of CaCO3 and rice husk ash has been delineated, and resulting interfacial strengths have been quantified using analytical models. Rice husk ash has shown a stronger interfacial anchoring and can effectively replace CaCO3 as reinforcement for achieving improved mechanical and thermal properties of polypropylene composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46989.

“…46 Sato and Furukawa 46 have developed an expression [eqs. (5) and (6)] for the modulus of the composite in the case where the adhesion is taken as a principal parameter…”

Section: Mechanical Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interfacial strengthening of polypropylene composites via bimodal porosity in Rice husk ash: Comparison with calcium carbonate reinforcement

Sharma

Lohia²,

Sharma³

et al. 2018

“…Due to rapid growth of technology and global population and exhaustion of oil and natural gas fuels, flue gases and their increasing environmental impacts such as greenhouse emission and global warming made it necessary to investigate and develop new clean energy sources . Lithium‐ion batteries with high specific energy, good life cycle, and no memory effect have been attracted a great deal of attention as high‐power energy storages system in cell phones, laptops, electrical vehicles, and so forth . A lithium ion battery contains an anode (negative electrode), a cathode (positive electrode), an electrolyte, and a separator .…”

Section: Introductionmentioning

confidence: 99%

Preparation of 4A zeolite coated polypropylene membrane for lithium‐ion batteries separator

Shekarian

Nasr

Mohammadi

et al. 2019

This study aims to improve wettability and thermal resistance of lithium‐ion batteries separators. For this purpose, a commercial polypropylene (PP) separator was coated by 4A zeolite using poly(vinylidene fluoride) as binder and effects of the separators' zeolite content was investigated. All the coated separators showed lower contact angles, higher electrolyte uptakes, and less thermal shrinkages compared to the neat commercial separator. The coated PPA8 separator (zeolite to binder ratio of 8) showed the lowest wettability (contact angle of 0°) and electrolyte uptake (270%) due to its surface porosity resulting from the zeolite particles interstitial cavities as well as their internal cavities. Also, the PPA8 separator ion conductivity was found as 2.25 mS cm−1 and C‐rate and cycling performance of its assembled battery were higher compared to those of the commercial PP separator assembled battery. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47841.

“…Through this mechanism, starch is initiated to generate free radicals; this, in turn, initiates acrylic acid monomers to form starch–acrylic acid free radicals. These radicals continue to react with acrylic acid; this makes the chain undergo growth and polymerization until chain termination occurs . The entire reaction process is outlined in Figure : Chain initiation: the decomposition of the initiator gives rise to primary free radicals, which in turn react with starch and acrylic acid monomers to form starch–acrylic acid free radicals. Chain growth: the produced starch–acrylic acid free radicals continue to react with alkene monomers to form free‐radical chains. Chain termination: the chain termination is triggered by the removal of hydrogen from the hydroxyl‐carrying carbon atoms. …”

Section: Methodsmentioning

confidence: 99%

Preparation and characterization of a binary‐graft‐based, water‐absorbing dust suppressant for coal transportation

Qiu

Nie

Liu

et al. 2018

During coal transportation, a large amount of coal dust is generated; this not only leads to a massive loss of coal but also causes severe environmental pollution. In this research, we used a chemical modification approach to prepare a highly water-absorbing dust suppressant. Corn starch, as the main ingredient, was copolymerized with acrylic acid and acrylamide, and acrylic acid and acrylamide were used to form a starch graft copolymer. Subsequently, in this research, we designed a suite of single-factor experiments using the viscosity as the metric to determine the optimal reaction conditions, which were as follows: mass ratio of acrylic acid to acrylamide = 3:2, neutrality = 50%, reaction time = 3 h, and reaction temperature = 50 C. Tests were carried out to assess the viscosity, water retention, and anti-evaporation performance of the dust suppressant. The results indicate that when the dust-suppressant concentration was 6%, the performance was optimized. Also, the anti-evaporation behavior of the suppressant improved with the dust-suppressant concentration. The use of this dust suppressant during coal transportation could greatly reduce dust dispersion and lead to improved environmental protection.