Polybutadiene/polyhedral oligomeric silsesquioxane nanohybrid: investigation of various reactants in polyesterification reaction

Abstract

Nano-sized polyhedral oligomeric silsesquioxane (POSS) diol or ethylene glycol (EG) as diol monomer was incorporated into hydroxyl-terminated polybutadiene (HTPBD) chain in the presence of fumaryl or thionyl chloride as extenders. Using these polyesterification reactions, two fumarate-based polyesters and two polyester sulfites were synthesized. Each couple of polyesters and polyester sulfites includes a linear (diol:EG) and a nanohybrid macromer (diol:POSS). Full structural characterization was performed using Fourier transform infrared, 1 H NMR and 13 C NMR spectroscopies. Gel permeation chromatography was undertaken to study polyesterification mechanisms by deconvolution of the obtained traces. Finally, differential scanning calorimetry, thermogravimetric analysis and cell culture were performed to evaluate the structure-property relationship for the synthesized macromers in comparison with unreacted HTPBD.

In-situ photocrosslinkable nanohybrid elastomer based on polybutadiene/polyhedral oligomeric silsesquioxane

“…Polyesterification reaction of diol comonomers (EG and POSS diol), HTPB and FuCl was fully studied in our recent work [23]. Unsaturated fumarate-based macromers (EG-PBF and POSS-PBF) were achieved by conducting a direct polycondensation reaction between diol species and acyl halide derivative of fumaric acid (FuCl) in the presence of K 2 CO 3 as a proton scavenger.…”

“…linear polybutadiene fumarate based on EG, HTPB and FuCl (EG-PBF) and its nanohybrid counterpart composed of POSS diol, HTPB and FuCl (POSS-PBF) is adopted from our recent works [3,23]. POSS diol nanoparticles and EG as diol comonomers were separately used for polyesterification reaction of HTPB.…”

“…After that, the mechanisms of polyesterification reactions were separately investigated for each resulting macromer. This was done by tracing the changes observed in the mean molecular weight and molecular weight distribution of the deconvoluted fractions detected in the GPC analyses of the synthesized macromers [23].…”

New high impact polystyrene: Use of poly(1‐hexene) and poly(1‐hexene‐co‐hexadiene) as impact modifiers

“…Poly1-hexene was synthesized by polymerizing 1-hexene monomer via Mg(OEt) 2 /FeCl 3 /TiCl 4 /DNBP catalyst in n-hexane solvent. 23,24 To understand the configurational arrangement of 1-hexene monomer unit in the synthesized PH, 13 C-nuclear magnetic resonance ( 13 CNMR)…”

“…The main contribution to photodegradation of PS/PB blends is usually attributed to the PB phase, in which various isomers with different stabilities against degradation are found. To overcome this drawback, PB is usually replaced by saturated rubbers consisting of terpolymers or copolymers of propylene and ethylene (such as ethylene propylene rubber [EPR]) . The blends show higher thermal stability than PS homopolymer, due to the stabilizing effect of EPR part .…”