Crosslinker Copolymerization for Property Control in Inverse Vulcanization

Abstract

Sulfur is an underused by-product of the petrochemicals industry.R ecent research into inverse vulcanization has shown how this excesss ulfur can be transformed into functional polymers, by stabilization with organic crosslinkers. For these interesting new materials to realize their potential for applications,m ore understanding and control of their physical properties is needed. Here we report four new terpolymers prepared from sulfur and two distinct alkene monomers that can be predictively tuned in glass transition, molecular weight, solubility,m echanical properties, and color.

Infrared Fingerprint Engineering: A Molecular‐Design Approach to Long‐Wave Infrared Transparency with Polymeric Materials

“…This enhancement of T g values and thermal stability is significant, since these thermal properties now approximate those for poly(methyl methacrylate) (PMMA), which is one of the optical industry standards for polymeric optical elements and far superior to poly(S-r-DIB) CHIPs.T he thermomechanical properties of the NBD2 thermoset offered significant melt-processing advantages for the fabrication of optical elements such as windows,l enses,a nd prisms on the order of 1-3 mm, which, for the first time,w ere amenable to diamond polishing to create optical quality elements (see Figure 3a). [19] Ther efractive index of the poly(S-r-NBD2) copolymers was found to range from n = 1.80-1.83 at ac omposition of 70:30 S/NBD2 and n = 1.74-1.77 at a50:50 composition, both in the range of 600-1500 nm ( Figure S4). [19] Ther efractive index of the poly(S-r-NBD2) copolymers was found to range from n = 1.80-1.83 at ac omposition of 70:30 S/NBD2 and n = 1.74-1.77 at a50:50 composition, both in the range of 600-1500 nm ( Figure S4).…”

Valorization of Lignin as a Sustainable Component of Structural Materials and Composites: Advances from 2011 to 2019

“…Although elemental sulfur itself is quite brittle, durable materials can be obtained for the copolymers comprising up to 90 wt.% sulfur [51][52][53][54]. These efforts have employed a wide range of starting materials including cellulose, lignin, amino acids, terpenoids, algae acids, polystyrene derivatives, and other olefins [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70]. More recently, radical-induced aryl halide/sulfur polymerization (RASP) proved similarly effective for preparation of high sulfur-content materials (HSMs) but employing aryl halides in place of the olefins required for inverse vulcanization.…”

Robust, remeltable and remarkably simple to prepare biomass–sulfur composites

“…We also hypothesized that unsaturated triglycerides that make up naturally occurring plant oils -present to varying extent in lignocellulosic waste streams -could contribute to crosslinking in biomass-sulfur composites derived from lessprocessed sources. The inverse vulcanization of triglycerides from a variety of plant oils has been reported 16,19,20,37,[40][41][42][43] and high mechanical strength can be achieved with relatively low (r5 wt%) triglyceride content. 44 The presence of plant oils could thus be an important factor in predicting how predominantly lignocellulosic biomass sources would perform as comonomers with sulfur.…”