Polybutadiene urethane

Imanishi et al. [33] pointed out that there was an optimum point at which the tethering density of PEO chains makes a polybutadiene urethane surface biocompatible. They also reported that bovine plasma FGN and bovine y-globulin adsorbed on the PEO-modified polyurethane were completely denatured, in comparison with 4-38% denaturation of BSA adsorbed. 

CN 302 Polybutadiene urethane diaciylate dispersant, pigment construction coatings... 

Figure 4.1.5. Volume of the increased swelling of crosslinked polybutadiene urethane elastomer, Xh b-85. Labels of points ...

The obtained theoretical predictions have been verified in experiments on real elastomers. The elastomers tested in our experiments were amorphous polybutadiene urethanes (PBU) wifli polymer network of different density 0.3 kmol/m (PBU-1), 0.05 kmol/m (PBU-2), 0.2 kmol/m (PBU-3), 0.1 kmol/m (PBU-4). Oligooxypropylene triol - Laprol 373 was used as a crosslinking agent at the curing of prepolymer of oligobutadiene diol. The elastomer specimens were manufactured in the form of disks, 35 mm in diameter and 2 mm thick. The kinetics of specimen swelling was determined in low-molecular liquids toluene, dibutyl sebacate (DBS), dioctyl sebacate (DOS). 

Crystallinity of polyethylene oxide plasticized with DOP in the concentration range from 0 to 25% was fairly constant. " Dibutyl phthalate did not affect the amoimt of VDF/HFP which crystalhzed in the presence of up to 50% of the plasticizer. Reduced crystallinity in polybutadiene urethane was found when DOS concentration was increased from 17 to 34% but this was compensated by the annealing process at 100°C. " Concentration of the plasticizer up to 50% in plasticized PVC did not affect its crystalhne order.Very little difference in crystallinity was observed between implasticized PVC and PVC containing 33% tricresyl phosphate (78 and 73%, respectively). Figure 10.58 is characteristic of results discussed so far. Crystallinity of plasticized PVC remains constant with the plasticizer concentration changing from... 

To understand the restrictions to swelling of SPU caused by the physical network containing hard domains, the following experiments were carried out. Segmented polybutadiene urethane urea (PBUU) on the base of oligobutadiene diol urethane prepolymer with functional NCO-groups (M 2400), cured with MOCA, and SPU-10 based on prepolymer cured with the mixture of MOCA and oligopropylene triol (M 5000) were used. The chemical network densities of PBUU and SPU were 0.05 and 0.08 kmol/m, respectively. The physical network density of initial sample, (VeA o)d> of PBUU was 0.99 kmol/m and of SPU-10 was 0.43 kmol/m. ... 

Typical OH-terminated polybutadiene urethane elastomer formulations are usually prepared using an NCO/OH ratio of 105. All ingredients, other than the diisocyanate, are normally blended by mechanical stirring and then degassing for 30 min at 80°C after which the diisocyanate is added. Test sheets are usually cured for 24 h at 23°C and post-cured for 24 h at 80°C. Pot life can be varied by adjusting the catalyst concentration. 

TYPICAL PROPERTIES OF OH-TERMINATED POLYBUTADIENE URETHANES CONTAINING 50 phr OF VARIOUS PROCESS OILS... 

Figure 4.1.5. Volume of the increased swelling of cross-linked polybutadiene urethane elastomer, Xh s o 83 -Labels of points 1 - outside volume, points with coordinates corresponding to solvents 2 - inside volume, points with coordinates corresponding to solvents 3 -the points with coordinates corresponding to polymer. This is the center of the volume. 4 - points placed on a...

Uses Pigment wetting agent for adhesives, barrier coatings, conformai coatings, eiectronic soider masks, photopoiymer printing piates, seaiants Trade Names CN 303 Polybutadiene urethane diacrylate... 

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