Sorption and diffusion of organic solvents through photo-crosslinked SBS block copolymers

Synthesis and Characterisation of Styrene Butadiene Styrene Based Grafted Copolymers for Use in Potential Biomedical Applications

“…In general, a liquid resin containing a photoinitiator (Benzophenone (BP)), is transformed into a solid polymer simply by exposure to UV light (Xiang et al, 2001;Murata et al, 2004;Rohr et al, 2003;. In order to ascertain a possible reaction site of the base polymer, Mateo et al,(2000) investigated the photoreactions of model compounds of SBS structures 1-heptene, 3-heptenes and cumene. They concluded that the main photoreaction induced by BP in heptene derivatives, models of the cis, trans and vinyl-double bonds of the polybutadiene sequences, is the abstraction of an allylic hydrogen atom by the BP, and that, in minor extension of other hydrogen atoms of the heptene aliphatic chain.…”

Cure Kinetics and Sorption Characteristics of Neoprene-Based Rubber Ferrite Composites

“…When n ¼ 1, the transport process corresponds to a mechanism where chain relaxation is slower than liquid diffusion, which is expected for rigid polymers. When the value of n is in between 0.5 and 1, transport behavior is termed as anomalous, where rearrangement of polymer segments occurs at a comparable rate to that of the change of concentration [21,22]. The value of n for different loadings of nickel ferrite in neoprene-based RFCs is given in Table 3.…”

Diffusion behavior of hexane in diamine chain‐extended hydroxyterminated polybutadiene based polyurethanes

“…Permeation is a collective process of diffusion and sorption and, hence, the permeability of solvent molecules in polymer depends on both the diffusion and solubility. 16 Permeability is the product of actual diffusion coefficient (D a ) and sorptivity. The value of S is taken as a gram of solvent absorbed per gram of polymer at equilibrium swelling.…”