Synthesis and Characterization of Nanostructured Blends of Epoxy Resin and Block Copolymers

Abstract

Polystyrene-polybutadiene block copolymers having different molecular architectures were epoxidized by using meta-chloroperoxybenzoic acid (MCPBA). Then, the blends with epoxy resin (diglycidyl ether of bisphenol-A; DGEBA) and their nanocomposites with boehmite and layered silicate nanofiller in presence of methylene dianiline (MDA) as a hardener were prepared. The epoxidized copolymers and the composites were characterized by Fourier transform infrared (FTIR) spectroscopy and microindentation technique. In this way, it was possible to tune the morphology of the nanostructured blends of the epoxy resin using the functionalized block copolymer as the template. The presence of nanostructured morphology was attested by the optical transparency of the blends as well as of the composites with nanofiller. The microhardness properties were improved by the incorporation of the nanoparticles, viz. boehmite and layered silicate.

Epoxidation of Styrene/Butadiene Star Block Copolymer by Different Methods and Characterization of the Blends with Epoxy Resin

“…Those properties evolve mainly due to the presence of inherent nanostructured morphologies which are adjustable by volume fraction of different components of the copolymer, interaction between different monomers and block copolymer chain architecture . On using them as a blend component in combination with other polymers and optimizing the processing parameters, these block copolymers can template nanostructured morphology in the blends as proved by several recent studies . Due to presence of the nanostructures, the blends of block copolymer with epoxy resins exhibit enhanced toughness.…”

Proton and Electron Conducting Polymer Composite Films Based on SBS Triblock Copolymer

“…The FTIR spectra of BCP, eBCP and sBCP (ionomer) are compared in Figure 2. The peaks centered at 910 cm −1 and 966 cm −1 are characteristic of the CC linkages present in the butadiene units of the block copolymer which represent the vibrations associated with trans‐ and cis‐ CC double bonds of 1,4‐polybutadiene, respectively 17…”

“…In the FTIR spectrum of epoxidized version, i.e., in eBCP, different additional peaks appear that are not present in the virgin copolymer. Among various peaks observed in the spectra, it is interesting to carefully look at the peaks centered at 734 cm −1 , 1072 cm −1 and 1158 cm −1 which have been assigned to the epoxy ring stretching 17, 18. The appearance of those peaks, thus, indicates the insertion of epoxy groups in the BCP and formation of epoxidized BCP (eBCP).…”

Synthesis and design of laboratory device from proton conducting block copolymer membrane

“…3b. The peak at 910 cm-1 is characteristic of the C=C linkages present in the butadiene units of the block copolymer and corresponds to the trans -C=C double bonds vibrations of 1,4-polybutadiene [11,12]. In the spectrum of eSBS, additional peaks, not present in the SBS copolymer, appear.…”