Polybutadienes hydroxyl-terminated

Water Treatment Microbicide. See Didecyidimonium chloride HS-451 Waterbed Microbicide. See Benzalkonium chloride HSA 12-HSA. See Hydroxystearic acid HSC Aspartame Fine, HSC Aspartame Peari 700, HSC Aspartame Powd. 200. See Aspartame HSZ-320NAA. See Aluminum silicate HTAB. See Cetrimonium bromide HTBD. See Polybutadiene, hydroxyl-terminated HTH Aikaiinity Pius Adjuster. See Sodium bicarbonate... 

Polybutadiene glycol. See Polybutadiene, hydroxyl-terminated Polybutadiene, hydroxyl-terminated Synonyms HTBD Poly BD glycol ... 

Octadecenyl succinic anhydride 1-Octenylsuccinic anhydride Polybutadiene, hydroxyl-terminated Polymethyl methacrylate Tetrapropenyl succinic anhydride... 

Meroxapol 105 Meroxapol 108 Meroxapol 171 Meroxapol 172 Meroxapol 174 Meroxapol 178 Meroxapol 251 Meroxapol 252 Meroxapol 254 Meroxapol 255 Meroxapol 258 Meroxapol 311 Meroxapol 312 Meroxapol 314 binder, road marking paints Isobutyl methacrylate Manila resin binder, road-marking paints Rubber, chlorinated binder, rocket fuels Polybutadiene, hydroxyl-terminated Polychloroprene binder, rocket propellants Polyurethane, thermoplastic binder, roof coatings Vinyl acrylic copolymer binder, rubber... 

Polybutadiene, hydroxyl-terminated pipe thread compounds Zinc dust... 

Table 1. Solubility parameter of polybutadiene, hydroxyl terminated. ...

Polyether-based thermoplastic copolyesters show a tendency toward oxidative degradation and hydrolysis at elevated temperature, which makes the use of stabilizer necessary. The problem could be overcome by incorporation of polyolehnic soft segments in PBT-based copolyesters [31,32]. Schmalz et al. [33] have proposed recently a more useful technique to incorporate nonpolar segments in PBT-based copolyesters. This involves a conventional two-step melt polycondensation of hydroxyl-terminated PEO-PEB-PEO (synthesized by chain extension of hydroxyl-terminated hydrogenated polybutadienes with ethylene oxide) and PBT-based copolyesters. 

Liquid rubbers In order to improve the flexibihty of short glass fiber-reinforced epoxy composites, Kaynak et al. [53] modified the epoxy resin matrix with hydroxyl-terminated polybutadiene (HTPB) liquid mbber. A silane coupling agent was also used to improve the interfacial adhesion between glass fibers and epoxy matrix. However, Humpidge et al. [54] reported some unique processing problems for the resulting pasty mixmres when short textile fibers were incorporated in a hquid mbber medium. 

Model networks were prepared using hydroxyl terminated polymer and isocyanates, (a) Bifunctional hydroxyl terminated polybutadiene (Butarez, from Phillips Petroleum) was crosslinkined with tris (p-isocyanatophenyl)-thiophosphate (Desmodur RF, from Mobay Chemical Co.). This crosslinked... 

The use of these initiators to polymerize LA814 and methylglycolide815 has been reported to proceed in a well-controlled fashion. Block copolymers such as PCL-b-PLA have also been prepared. Elimination of PrOH from the reaction of (270) with preformed hydroxyl terminated polymers, followed by lactone polymerization, yields diblocks of CL with polystyrene or polybutadiene.816 The preparation of an ABA triblock has also been reported (A = CL, B = LA) since propagating chains of PLA do not initiate CL ring opening, (270) was pretreated with hydroxy terminated (PCL-b-PLA)-OH 814... 

Poly butadienes. Hydroxyl-terminated polybutadienes are comparatively late comers and are still in the development stage. They combine the high specific impulse of the well-proved carboxy-terminated polybutadienes with the clean, stoichiometric urethane reaction yielding propellants with unsurpassed mechanical properties. 

Contrary to the general trend described above, hydroxyl terminated polybutadiene (a polyurethane) has a burning rate curve which bends concave downward below 0.3 atm. (Figure 16), and the extinction pressure of this propellant is rather high (0.18 atm.). The burned surface of extinguished samples of this propellant had a glistening black appearance. 

Examples of Separating Hydroxyl-Terminated Polyesters and Polybutadienes... 

The effect of curing on the diffusion of polymer and the curing agent is studied for the system of hydroxyl-terminated polybutadiene (R-45-M)/isophorone disso-cyanate (IPDI). Both components contribute to the echo intensity and the plot of In P(x)/I(0)] vs (G5)2 (A — 5/3) consists of two exponentials (Eq. (22)) the fast component (the steep intial slope) is attributed to the IPDI, and the long component to the R-45-M. The dependence of both diffusion constants on the curing time is shown in Fig. 19. The accuracy for Dfast data is less pronounced than for the polymer D(Mn), because only the first few data points are relevant for its determination. Furthermore, the low tail of the R-45-M molecular weight distribution nearly coin-... 

The compound was examined as a propellant explosive, it proved easily detonable and more sensitive than ammonium perchlorate. A formulation with hydroxyl terminated polybutadiene binder ignited spontaneously at room temperature [1]. Other workers have found it more tractable [2]. Detailed study of properties has been made. It is too friction sensitive for safe transport [3]. 

Figure 7.7 SAXS profiles for two hydroxyl-terminated oligomers crosslinked by alkoxysilane sol-gel chemistry. First, 1 mole of macrodiol, SS (hydrogenated polybutadiene, HPBD or polycaprolactone, PCL, Mn= 2 kg mol-1), was reacted at 80°C with 2 mole of dicyclohexylmethane diisocyanate, H12 MDI. After complete reaction, the prepolymer was dissolved in tetrahydro-furan and the y-aminosilane, yAPS was added dropwise at room temperature. After 1 h of reaction, the solvent was removed under pressure. The final network was obtained in the absence of a solvent by hydrolysis and condensation of the ethoxysilane groups by the addition of 0.1 mol% TFA, trifluor-oacetic acid. After stirring at room temperature, the mixture was cast into a mold and cured for 24 h at 100°C under pressure, and then postcured at 150°C for 12 h. (Cuney et al., 1997 - Copyright 2001, Reprinted by permission of John Wiley Sons, Inc.)...

Recently ICLwas used to follow the diffusion-limited oxidation of hydroxyl terminated polybutadiene at various temperatures and oxygen pressures. The CL intensity profiles were found to correlate well with theoretical oxygen concentration profiles [137]. 

Fig. 2.13 Homopolymeric R45HT (hydroxyl terminated polybutadiene, HTPB).

Using other diazo compounds [di(3-hydroxybutyl)-2,2 -azobisisobutyrate, di(2-hydroxypropyl)-2,2 -azobisisobutyrate and di(2-hydroxyethyl)-2,2 -azobisisobuty-rate] hydroxytelechelic polybutadienes containing primary or secondary hydroxyl terminal groups were prepared 32). The decomposition kinetics of di(4-hydroxybutyl)-2,2 -azobisisobutyrate and di(3-hydroxybutyl)-2,2 -azobisisobutyrate is faster than that of 4,4 -azobis(4-cyano-n-pentanol). Usually, at the same temperature and in the same solvent, the decomposition of di(x-hydroxyalkyl)-2,2 -azobisisobutyrate is faster than that of AIBN 35). The solvent polarity has no effect on the decomposition kinetics. 

The x,x -azobis(x-cyano-alkanol)s are prepared by the Strecker synthesis followed by oxidation of the hydrazo intermediate. The same method was also used for 4,4 -azobis(4-cyano-n-pentanol) and 5,5 -azobis(5-cyanohexane-2-ol). The former one was a good initiator for secondary hydroxyl-terminated polydienes. Similar results were reported by Reed (see Sect. 1.1.2. a) for hydroxytelechelic polybutadienes (the functionality was 1.9 to 2.5, generally higher than 2, M < 5000). 

The physical data (dynamic modulus, tensile strength, hardness, elongation at break) were investigated by many groups 202,205 210) (cf., Table 4.5 as an example). These results show that the elastomer physical properties become better by increasing the molar ratio of low-molecular-weight diol to hydroxyl-terminated polybutadiene. 

Elastomers are prepared by chain extension of hydroxyl-terminated low-molecular-weight polymers followed by vulcanization 180). The most important work concerns the use of hydroxy telechelic polybutadienes and polyisoprenes in the tire industry 249 252>. The hydroxylated polydienes of molecular weight 1000-20000 are mixed with a diisocyanate, a catalyst, vulcanization agent (sulfur), and accelerator, reinforcing additives (carbon black), and surface-active agents. The reaction takes place in two steps simultaneously or consecutively ... 

Koncos, R. Present and Future Applications of Liquid Hydroxylated Terminated Polybutadiene , ARCO Chemical Company paper N° 23, read at the 3-6 October (1972) Session of the ACS... 

Examples of commercially available polymers are the Poly bd R45-HTLO Resin of Sartomer (hydroxyl-terminated homopolymer of polybutadiene) or Kraton Liquid L-2203 (hydroxyl-terminated ethylene/butylene polymer) of Kraton Polymers. 

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