PBMA Poly

GFR Glass-fibre reinforced PBMA PBT Poly(butyl methacrylate) Poly(butylene terephthalate)... 

Poly(butyl methacrylate) (PBMA) began to be used as a picture varnish in the early 1930s. It encountered a considerable success because of its resistance to yellowing, adequate flexibility, no dirt pick-up and good solubility in nonpolar hydrocarbon solvents. Products based on PBMA, such as Elvacite 2044 and Elvacite 2045 by Du Pont, were abandoned when it was discovered that under light exposure they cross-link to an unexpected extent becoming insoluble [64]. From this point of view acrylic copolymers based on methyl and ethyl acrylates/methacrylates show a much better long-term stability. 

This analysis leads to the conclusion that equation 1 is obeyed well by certain anthracene/polymer combinations, but there are significant deviations for others. DMA/PEMA (poly(ethyl methacrylate)) and DPA/PBMA (poly(butyl methacrylate)) fit equation 1 exactly, while DPA/PEMA (both with and without sensitizer) and DPA/PDPS (poly(diphenylsiloxane)) deviate the actual reaction proceeds more slowly with dose than predicted, and the deviation increases as the dose increases. 

Chart 2.6 Structure of block copolymer based on PEO and poly(benzyl methacrylate) (PBMA) containing /3-D-galactose unit. 

Rubber-toughened polystyrene composites were obtained similarly by polymerising the dispersed phase of a styrene/SBS solution o/w HIPE [171], or a styrene/MMA/(SBS or butyl methacrylate) o/w HIPE [172], The latter materials were found to be tougher, however, all polymer composites had mechanical properties comparable to bulk materials. Other rubber composite materials have been prepared from PVC and poly(butyl methacrylate) (PBMA) [173], via three routes a) blending partially polymerised o/w HIPEs of vi-nylidene chloride (VDC) and BMA, followed by complete polymerisation b) employing a solution of PBMA in VDC as the dispersed phase, with subsequent polymerisation and c) blending partially polymerised VDC HIPE with BMA monomer, then polymerisation. All materials obtained possessed mixtures of both homopolymers plus some copolymer, and had better mechanical properties than the linear copolymers. The third method was found to produce the best material. 

Block copolymers can be produced from terminally borane-containing polyolefins. These borane-containing POs can be synthesized by the metallocene-catalyzed (co)polymerization of olefin(s) monomer with 9-BBN as a chain transfer agent or by the metallocene catalyzed copolymerization of olefins with allyl-9-BBN [55,56], as referred to above. Alternatively, borane-containing POs were prepared by hydroboration of terminally unsaturated PO, for instance, terminally vinyl PE and terminally vinylidene PP [33-35,57]. Such method could produce diblock copolymers, such as polyethylene-block-poly(methyl methacrylate) (PE-fo-PMMA), polypropylene-foZock-poly(methyl methacrylate) (PP-fc-PMMA), polypropylene-foZock-poly(butyl methacrylate) (PP-fc-PBMA), and PP-fc-PS. 

The CYPHER stent employs two nonerodible polymers polyethylene-co-vinyl acetate (PEVA) and poly-n-butyl methacrylate (PBMA), The combination of sirolimus and these two polymers constitutes the basecoat formulation that is applied to a stent treated with paryleneC. In addition, a drug-free topcoat of PBMA polymer is applied to control the release kinetics of sirolimus (59), making this a diffusion-controlled reservoir device. The chemical structure of the polymers used in the CYPHER stent is shown in Figure 4,... 

Polymers used in the CYPHER sirolimus-eluting stent. Abbreviations PBMA, poly-n-butyl methacrylate PEVA, polyethylene-co-vinyl acetate. 

Biostable polymers have been chosen for use in the majority of DES that are marketed or in clinical development. The main attractiveness of biostable polymers is their physical stability, inertness toward the drug, and predictable drug kinetics. In Cypher, a blend of poly(ethylene-co-butyl methacrylate) (PEVAc/PBMA) is used as the drug carrier. This hydrophobic polymer, along with additional polymer process steps, effectively controls the release of sirolimus, eluting 80% of the drug over 30 days after implantation. In the case of Taxus, atri-block copolymer of styrene-isobutylene-styrene (SIBS) is used as the hydrophobic polymer matrix that releases 10% of incorporated paclitaxel in the first 30 days (20). 

The Cypher sirolimus-eluting stent from Cordis uses a blend of poly(ethylene-co-vinyl acetate) (PEVA) and poly(n-butyl methacrylate) (PBMA) as the polymeric matrix for sirolimus release. Both PEVA and PBMA have individually been used as implants in humans and demonstrated excellent biocompatibility. The blend of PEVA and PBMA is physically mixed with sirolimus in a weight ratio of 2 1. In vivo studies have shown that the majority of the drug is released in a sustained fashion in 30 days with complete drug release in 90 days as... 

Abbreviations PBMA, poly (ethylene-co-butyl methacrylate) PC, phosphoryl choline PEVAc, poly (ethylene-co-vinyl autate) PLGA, poly (lactide-co-glycolide) SIBS, styrene-isobutylene-styrene SS,. ... 

We have been interested in studying molecular dynamics of polymer chains and alkyl groups anchored at one end, particularly n-alkyl glycol and glycerol derivatives, poly(n-butyl acrylate) (PBA), poly(n-butyl methacrylate) (PBMA), and poly(n-hexyl meth-... 

Decanediol (DD) and 1,2-hexadecanediol (HDD) were synthesized from their respective alkenes(19). 1,2,3-decanetriols (DT) were prepared by a procedure described in the literature (20). Poly(n-butyl methacrylate)(PBMA) was obtained from Polyscience as high molecular weight material. Solutions were made without further purification using toluene-dg as a solvent. Poly(n-hexyl methacrylate)(PHMA) and Poly (ri-butyl acrylate)(PBA) were purchased as toluene solutions (25 wt%) from Aldrich Chemical Co. 

Similar extensive calculation have also been performed with the data from PBMA and PHMA(8). Selected data for C-l of the poly (ri-alkyl acrylates) are shown in Table XIII. Rather than trying to closely fit each of the data sets with variable parameterization of T, p, and, values were chosen to encompass the relaxation characteristics of the entire temperature range used in the study. The same insensitivity of T to temperature variation observed in the experimental data is also seen in the calculated data when T is changed by two orders of magnitude (Table XIII). Even with a relatively narrow distribution (p=50) a large T field dependence and low NOEF is observed. 

Alternative Fblymer Matrices. The prospect for alternative matrix materials (Table II) for calcium ISEs has been examined in conjunction with the model liquid calciun ion-exchanger/DOPP cocktail (2). Evidently functional electrodes can be fabricated with poly(2-methyl propyl methacrylate) (P2-MFMA) but not with the corresponding poly(butyl methacrylate) (PBMA), poly(methyl methacrylate ) (PMMA) or... 

PB PBI PBMA PBO PBT(H) PBTP PC PCHMA PCTFE PDAP PDMS PE PEHD PELD PEMD PEC PEEK PEG PEI PEK PEN PEO PES PET PF PI PIB PMA PMMA PMI PMP POB POM PP PPE PPP PPPE PPQ PPS PPSU PS PSU PTFE PTMT PU PUR Poly(n.butylene) Poly(benzimidazole) Poly(n.butyl methacrylate) Poly(benzoxazole) Poly(benzthiazole) Poly(butylene glycol terephthalate) Polycarbonate Poly(cyclohexyl methacrylate) Poly(chloro-trifluoro ethylene) Poly(diallyl phthalate) Poly(dimethyl siloxane) Polyethylene High density polyethylene Low density polyethylene Medium density polyethylene Chlorinated polyethylene Poly-ether-ether ketone poly(ethylene glycol) Poly-ether-imide Poly-ether ketone Poly(ethylene-2,6-naphthalene dicarboxylate) Poly(ethylene oxide) Poly-ether sulfone Poly(ethylene terephthalate) Phenol formaldehyde resin Polyimide Polyisobutylene Poly(methyl acrylate) Poly(methyl methacrylate) Poly(methacryl imide) Poly(methylpentene) Poly(hydroxy-benzoate) Polyoxymethylene = polyacetal = polyformaldehyde Polypropylene Poly (2,6-dimethyl-l,4-phenylene ether) = Poly(phenylene oxide) Polyp araphenylene Poly(2,6-diphenyl-l,4-phenylene ether) Poly(phenyl quinoxaline) Polyphenylene sulfide, polysulfide Polyphenylene sulfone Polystyrene Polysulfone Poly(tetrafluoroethylene) Poly(tetramethylene terephthalate) Polyurethane Polyurethane rubber... 

Notes T= reaction temperature, Tg = glass transition temperature, PS=polystyrene, PMMA=poly(methyl methacrylate), PPMA=poly(propyl methacrylate), PBMA=poly(butyl methacrylate), Ain- =irradiation wavelength. 

PBAD PBMA P(BMA S) P(BMA a-S) P(BSAC) poly(butylene adipate) poly(n-butyl methacrylate) poly(n-butyl methacrylate-co-styrene) poly(n-butyl methacrylate-co-atactic-styrene) poly(bisphenol-a-carbonate)... 

PDMAEMA-fo-PBMA) [62] in alcohols and polystyrene-h-polybutadiene (PS-h-PB) [49] andpolystyrene-h-poly(propyrene-flZt- ethylene) (PS-h-(PP-aZt-E)) [58], linear PS [47], and PMMA [47] in hydrocarbon are used. 

The adhesion and wettability of thin films of poly(n-butyl methacrylate)(PBMA) and (butyl methacrylate/co-acrylic acid)(AA/BMA) cast from various solvents was studied. Most PBMA films showed adhesive failure regardless of the solvent from which they were cast. The AA/BMA films showed better adhesive properties when cast from the hydrogen-bonding solvents t-butanol and p-dioxane. 

Polymers. High molecular weight poly(n-butyl methacrylate) (PBMA) was obtained from Scientific Polymer Products Inc. and used as such. The viscosity-average molecular weight, Rv, was determined by the Kark-Houwink-Sakurada equation... 

Poly(butyl methacrylate) (PBMA) 0 n-butyl/isobutyl 0.29 0.5... 

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