Topic
Polymer blend
About: Polymer blend is a research topic. Over the lifetime, 18474 publications have been published within this topic receiving 437183 citations. The topic is also known as: polymer mixture & Polymerblend 或者 Polyblend.
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19 Jul 2018
TL;DR: This review presents the recent advances on battery separators based on PVDF and its copolymers for lithium-ion batteries and a critical comparison between those membranes and other separator membranes is presented, as well as the future trends on this area.
Abstract: The separator membrane is an essential component of lithium-ion batteries, separating the anode and cathode, and controlling the number and mobility of the lithium ions. Among the polymer matrices most commonly investigated for battery separators are poly(vinylidene fluoride) (PVDF) and its copolymers poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and poly(vinylidene fluoride-cochlorotrifluoroethylene) (PVDF-CTFE), due to their excellent properties such as high polarity and the possibility of controlling the porosity of the materials through binary and ternary polymer/solvent systems, among others. This review presents the recent advances on battery separators based on PVDF and its copolymers for lithium-ion batteries. It is divided into the following sections: single polymer and co-polymers, surface modification, composites, and polymer blends. Further, a critical comparison between those membranes and other separator membranes is presented, as well as the future trends on this area.
125 citations
TL;DR: In this paper, a concept named dynamic percolation is proposed to monitor the dynamic process of conductive network formation in conductive polymer composites, where the composites are annealed at a temperature above the melt point of polymer matrix.
125 citations
TL;DR: In this paper, the thermal properties were analyzed by differential scanning calorimetry, rheology and thermogravimetric analysis, and Fourier infrared measurements were utilized to explain the lignin/TPU interactions which governed the thermal and rheological behavior of the blends.
Abstract: The production of carbon fibers based on lignin reduces the cost and the environmental impact associated with carbon fiber manufacturing. However, the melt processing of lignin as a carbon fiber precursor is challenging due to its brittleness and limited thermoplastic behavior. For this reason we produce biopolymer blends based on Alcell organosolv hardwood lignin, hydroxypropyl modified Kraft hardwood, and a thermoplastic elastomer polyurethane (TPU). Samples with TPU content greater than 30% showed excellent melt processability and carbonization yield (35% carbon yield for the samples containing 30% of TPU). The thermal properties were analyzed by differential scanning calorimetry, rheology and thermogravimetric analysis. Fourier infrared measurements were utilized to explain the lignin/TPU interactions which governed the thermal and rheological behavior of the blends. SEM analysis showed that the blends produce a homogeneous structure which was void free after carbonization. These structurally compleme...
125 citations
TL;DR: In this article, the formation of core-sheath structures depends on both thermodynamic and kinetic factors, and it was found that polymer blends with lower molecular weight tend to form co-continuous structures, as a result of their higher molecular mobility.
Abstract: Electrospinning of polymer blends offers the potential to prepare functional nanofibers for use in a variety of applications. This work focused on control of the internal morphology of nanofibers prepared by electrospinning polymer blends to obtain core-sheath structures. Polybutadiene/ polystyrene, poly(methylmethacrylate)/polystyrene, polybutadiene/ poly(methylmethacrylate), polybutadiene/polycarbonate, polyaniline/polycarbonate, and poly(methylmethacrylate)/ polycarbonate blends were electrospun from polymer solutions. It was found that the formation of core-sheath structures depends on both thermodynamic and kinetic factors. Incompatibility and large solubility parameter difference of the two polymers is helpful for good phase separation, but not sufficient for the formation of core-sheath structures. Kinetic factors, however, play a much more important role in the development of the nanofiber morphology. During the electrospinning process, the rapid solvent evaporation requires systems with high molecular mobility for the formation of core-sheath structures. It was found that polymer blends with lower molecular weight tend to form core-sheath structures rather than co-continuous structures, as a result of their higher molecular mobility. Rheological factors also affect the internal phase morphology of nanofibers. It was observed the composition with higher viscosity was always located at the center and the composition with lower viscosity located outside.
124 citations
TL;DR: In this article, the polymer electrolytes composed of a blend of poly(ethylene oxide) (PEO) and poly(vinylidene fluoride-co-hexafluoropropylene)(P(VDF-HFP)) as a host polymer, mixture of ethylene carbonate (EC) and propylene carbonates (PC) as a plasticizer, and LiClO 4 as a salt were prepared by a solution casting technique.
124 citations