2S-Soy Protein-Based Biopolymer as a Non-Covalent Surfactant and Its Effects on Electrical Conduction and Dielectric Relaxation of Polymer Nanocomposites

Abstract

2S-soy protein, a biopolymer extracted from soy protein isolate (2S-SPI), was studied as a non-covalent surfactant for polymer nanocomposites. This study showed that 2S-SPI effectively improved carbon nanofibers (CNFs) dispersion in poly(vinylidene fluoride). 2S-SPI surfactant had remarkable impact on both electrical conduction and dielectric relaxation of the nanocomposites, particularly, at high temperatures. 2S-SPI modified CNFs caused coupling of conductivity relaxation and structural relaxations of the nanocomposites, in contrast to pristine CNFs. Both Maxwell-Wagner-Sillars and conductivity relaxations were enhanced at high temperatures by 2S-SPI, which made different contributions to electrical conduction of the nanocomposites with or without surface modification.

Synergistically Toughening Polyoxymethylene by Methyl Methacrylate–Butadiene–Styrene Copolymer and Thermoplastic Polyurethane

“…Biopolymer 2S‐soy protein (extracted from soy protein isolate (2S‐SPI)) functionalzied carbon nanofiber (CNFs) demonstrated a better disperion of CNFs in PVDF. The formed nanocomposites with functionalized CNFs demonstrated a dominant long‐range charge hopping electrical conduction, different from the Maxwell–Wagner–Sillars (MWS) relaxation dominat electrical condution observed in the nanocomposites with untreated CNFs . 2S‐SPI modification also led to a strong coupling between conductivity relaxation and MWS relaxation in the PVDF nanocomposites, accompanied by greater enhancement of conductivity relaxation .…”

“…The crystallinities of POM in the blends were calculated using Equation where is the enthalpy of fusion of the blends, is the theoretic value of enthalpy at X c = 100% (190 J g −1 ) …”

“…The formed nanocomposites with functionalized CNFs demonstrated a dominant long‐range charge hopping electrical conduction, different from the Maxwell–Wagner–Sillars (MWS) relaxation dominat electrical condution observed in the nanocomposites with untreated CNFs . 2S‐SPI modification also led to a strong coupling between conductivity relaxation and MWS relaxation in the PVDF nanocomposites, accompanied by greater enhancement of conductivity relaxation . Meanwhile, compared with pure carbon, metal, or ceramics, flexible engineering plastics can make machine parts at much lower temperatures and easier processing methods.…”

“…Despite widespread availability, the poor compatibility of POM with other polymers limits its applications . For instance, reduced interfacial adhesion was observed between POM and most toughening agents . Kumar et al demonstrated that the addition of poly(acrylic acid)‐grafted polypropylene (PGP) into POM/ethylene‐proplene‐diene monomer (EPDM) blend as compatibilizer improved its impact strength .…”

Preparation and Characterization of magnetic PLA/Fe3O4-g-PLLA composite melt blown nonwoven fabric for air filtration

“…Fortunately, many biodegradable polymers have appeared, and their application can relieve the press from environment and energy. [15][16][17][18][19][20][21][22][23] Some of them have appropriate spinnability and are used for the fabrication of MB. [24][25][26] Poly (lactic acid) (PLA), mainly derived from starch, corn, sugar and some other renewable plant resources, is a typical eco-friendly bio-based polymer and has exhibited the vast commercial market prospects in the fibers, film and biomedical materials.…”