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Polycaprolactone polyurethanes

Plasticization Polycaprolactone, polyurethanes, nitrile rubber, ethylene-vinyl acetate, copolyester, chlorinated polyoxymethylenes (acetals)... [Pg.347]

Figure 3. Small-angle x-ray scattering intensity curves demonstrating the effect of soft-segment molecular weight for three polycaprolactone polyurethanes (MDI/BD) of approximately equal hard-segment content. (A) 57% by wt, FCL 2000-178 (S) (B) 53% by wt FCL 830-123 (S) and (C) 61% by wt, FCL 830-134 (S). Figure 3. Small-angle x-ray scattering intensity curves demonstrating the effect of soft-segment molecular weight for three polycaprolactone polyurethanes (MDI/BD) of approximately equal hard-segment content. (A) 57% by wt, FCL 2000-178 (S) (B) 53% by wt FCL 830-123 (S) and (C) 61% by wt, FCL 830-134 (S).
Blends of PC/PET/TPU with EVAc-GMA and optionally MBS or ABS, have good flexural modulus, strength, weld line strength, solvent resistance, and impact behavior [Laughner, 1994]. PC blends with a polycaprolactone-polyurethane resin, TPU Pellethane , and either MBS or MBA showed similar behavior [Henton et al., 1993]. [Pg.74]

Chemical functionalization of CNT surfaces could improve their dispersion in the polymer matrix and enhance the nanotube-polymer interfacial interaction and the mechanical load transfer. The effects of nanotube functionalization on the properties of CNT-TPU composites have been investigated in details. Xia and Song have synthesized polycaprolactone polyurethane (PU)-grafted SWNTs (PU-g-SWNTs) and corresponding PU-g-SWNT-PU composites by in-situ polymerization. The results show that PU-g-SWNTs improve the dispersion of SWNTs in the PU matrix and strengthen the interfacial interaction between the PU and SWNTs. Compared with neat PU and pristine SWNT PU composites, PU-g-SWNT-PU composites demonstrate remarkable enhancement on Young s modulus. The Young s modulus of a 0.7 wt /o PU-g-SWNT-PU composite increases by 178% over the blank PU and 88% over the 0.7 wt% pristine SWNT-PU composite, respectively. [Pg.27]

Experimental product composed of starch, polycaprolactone, polyurethane (Estane 54351)... [Pg.179]

Bogart, V, John, W. C., Gibson,P. E.,Cooper, S. L. (1983), Structure- operty relationships in polycaprolactone-polyurethanes, J. Pofynt. Sci., Polym. Phys. Ed., 21,65-95. Bogdanov, B., Toncheva, V., Schacht, E., Finefli, L., Sartib, B., Scandola, M. (1999), Physical properties of poly(ester-urethanes) prepared Irom diflerent molar mass polycaprolactone-diols,Po/yraer, 40, 3171-82. [Pg.108]

Among the polyurethane, polyester, and polyamide thermoplastic elastomers, those with polyether-based elastomer segments have better hydrolytic stabihty and low temperature flexibiUty, whereas polyester-based analogues are tougher and have the best oil resistance (43). Polycaprolactones and aUphatic polycarbonates, two special types of polyesters, are used to produce premium-grade polyurethanes (12). [Pg.14]

Most thermoplastic elastomers are stable materials and decompose only slowly under normal processing conditions. If decomposition does occur, the products are usuaHy not particularly ha2ardous and should not present a problem if good ventilation is provided. Extra caution should be exercised when processing polyurethanes, especiaHy those containing polycaprolactone segments. In these cases the decomposition products may include isocyanates and caprolactam, both of which are potential carcinogens. [Pg.20]

Thermoplastic polyurethane elastomers have now been available for many years (and were described in the first edition of this book). The adipate polyester-based materials have outstanding abrasion and tear resistance as well as very good resistance to oils and oxidative degradation. The polyether-based materials are more noted for their resistance to hydrolysis and fungal attack. Rather specialised polymers based on polycaprolactone (Section 25.11) may be considered as premium grade materials with good all round properties. [Pg.879]

Impact resistance ABS, methacyrylate-butadiene-styrene, acrylics, polycaprolactone, polyimide, polyurethanes, PVC-ethyl acrylate... [Pg.347]

We report here that polyethylene adipate (PEA) and polycaprolactone (PCL) were degraded by Penicillium spp., and aliphatic and alicyclic polyesters,ester type polyurethanes, copolyesters composed of aliphatic and aromatic polyester (CPE) and copolyamide-esters (CPAE) were hydrolyzed by several lipases and an esterase. Concerning these water-insoluble condensation polymers, we noted that the melting points (Tm) had a effect on biodegradability. [Pg.136]

Figure 6.6 Evolution of tan 8 during polyurethane synthesis at 110°C, at different angular frequencies, Figure 6.6 Evolution of tan 8 during polyurethane synthesis at 110°C, at different angular frequencies, <o (s 1) = 1 (V), 3.162 (X), 10(A), 31.62 ( ), and 100 (+). A polycaprolactone diol, Mn = 700 g mol1 was stoichiometri-cally reacted in bulk with a triisocyanate (the trimer of isophorone diisocyanate). The time tc at which tan 8 is independent of frequency determines the gel point. The critical gel exhibits values of tan 8=1.4 and A = 0.61. (Reprinted with permission from Izuka et at., 1994. Copyright 2001. American Chemical Society)...
PLC Polycaprolactone Polyester polyol Programmable logic controller A polymer made by ring opening caprolactam. A chemical building block. The polyester provides good solvent resistance and good mechanical properties in the final polyurethane. [Pg.222]

Abbreviations CEL, cellulose DXM, dexamethasone EIPA, ethylisopropylamiloride FIB, fibrin MR methylprednisolone NA, not available Neo-R, neointima reduction PC, phosphorylcholine PCL, polycaprolactone PFM-P75, polyfluoroalkoxyphosphazene PLLA(PLA), poly-L-lactic acid POP, polyorganophosphazene PU, polyurethane Q-DL, Quanam drug eluting stent Q-M, Quanam metal stent SNR sodium nitroprusside TIMP, tissue inhibitors of metalloproteinase. [Pg.258]

In this chapter we investigate the morphology of a series of polyurethanes based on polycaprolactone polyol (PCP), diphenylmethane diisocyanate (MDI), and butanediol (BDO). Samples of as-batch-reacted and solution-cast polymers were examined by optical microscopy, transmission electron microscopy, electron and x-ray diffraction, and differential scanning calorimetry. Our interest is to provide a mapping of the size and shape of the domains (and any superstructure such as spherulites) and the degree of order as a function of the fraction of each phase present. [Pg.38]

The a Relaxation of 2,4-T-lP. Only the 2,4-T-lP block polyurethanes exhibited a single major a relaxation which had a strongly composition-dependent position. Similar behavior was observed by See-fried and co-workers (10) for polyurethanes containing a TDI/BD hard segment and a 2100-Mn polycaprolactone hard segment. The extreme... [Pg.123]

The IPNs prepared were composed of a rubbery polyurethane and a glassy epoxy component. For the polyurethane portion, a carbodiimide-modified diphenyl-methane diisocyanate (Isonate 143L) was used with a polycaprolactone glycol (TONE polyol 0230) and a dibutyltin dilaurate catalyst (T-12). For the epoxy, a bisphenol-A epichlorohydrin (DER 330) was used with a Lewis acid catalyst system (BF -etherate). The catalysts crosslink via a ring-opening mechanism and were intentionally selected to provide minimum grafting with any of the polyurethane components. The urethane/epoxy ratio was maintained constant at 50/50. A number of fillers were included in the IPN formulations. The materials used are shown in Table I. [Pg.367]

Low profile plastics are added to reduce shrinkage during cure. They are normally thermoplastics that include polyvinyl acetates, polymethyl methacrylate, and copolymers with other acrylate, vinyl chloride-vinyl acetate copolymers, polyurethane, polystyrene, polycaprolactone, cellulose acetate butyrate, saturated polyester, and styrene butadiene copolymers. More details about the low profile additive (LPA) mechanism are published in the literature. ... [Pg.285]

Results qualitatively similar to those in Figure 2 were obtained with polyurethanes made from toluene dllsocyanate (TDI), BD, and 1) PCL 2000 2) a polycaprolactone diol of molecular weight 1220 (PCL 1220) 3) a polyethyleneadlpate diol of molecular weight 2000 (PEAD 2000). However, all TDI based polymers had very low stress values at 60 C. [Pg.146]

Indeed most polymers are receptive to attack including cellulose nitrate, cellulose acetate, polycaprolactone, polyethylene succinate, polyethylene adipate, polyvinyl alcohol, polybutadiene, styrene butadiene, butyl acrylonitrile, butadiene acrylonitrile, polyester polyurethanes, polyacetate, polyglycollate, polydioxanone and Nylon 2,6. [Pg.7]

A polyurethane was synthesised from 1,6-hexane diisocyanate, polycaprolactone diol and a fluoroquinolone antibiotic, ciprofloxacin and characterised by size exclusion chromatography and elemental analysis. The PU was incubated in a solution of an inflanunatoiy cell-derived enzyme, cholesterol esterase or phosphate buffer for 30 days at 37C and its biodegradability determined by HPLC, mass spectroscopy and Carbon 14 radiolabel release. Analysis of the solution revealed that ciprofloxacin was released and able to inhibit the growth of Pseudomonas aeruginosa. 53 refs. [Pg.72]


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See also in sourсe #XX -- [ Pg.11 , Pg.12 ]




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