POLY-N-BUTYL METHACRYLATE

Polystyrene-PDMS block copolymers4l2), and poly(n-butyl methacrylate-acrylic acid)-PDMS graft copolymers 308) have been used as pressure sensitive adhesives. Hot melt adhesives based on polycarbonate-PDMS segmented copolymers 413) showed very good adhesion to substrates with low surface energies without the need for surface preparation, such as etching. 

Polystyrene standards used were narrow molecular weight distribution sample produced by anionic polymerization and available from Pressure Chemical Co. Also sample NBS7C from the National Bureau of Standards was used. The sample of poly n-butyl methacrylate was obtained from Aldrich Chemical. It was produced by free radici polymerization with an Mw of 320,(XK) and an Mn of 73,500 (Cat. No. 18,153-6). 

Figure 21 shows the result of sampling a 50 50 blend of NBS706 and poly n-butyl methacrylate using Column Codes A4 and B4 (Table I) injecting a total of 1.5 mg into GPC 1. 

Methyl and ethyl methacrylate polymers, although extensively used in Industry, do not possess the solubility characteristics (low polarity) that would make them appropriate for use over traditional oil paintings and other organic-based museum objects that might be sensitive to polar solvents such as alcohols, ketones and esters. Poly(n-butyl methacrylate), offered as an artists varnish in the late 1930 s, did not become widely accepted in the war-disrupted decade that followed. Accordingly, early in 1951, our laboratory began a detailed study of the higher alkyl methacrylate polymers for potential use as picture varnishes (1). 

C Spin-Lattice Relaxation-Times and n.O.e. Values of Resonance of Poly(n-butyl methacrylate) as 50% (w/w) Solution in Toluene-2H8... 

Fig. 57. Gladstone - Dale plots [Eq. (110)] for solutions of (a) polystyrene, (b) poly-n-butyl methacrylate, (c) polymethyl methacrylate165 = 436 nm)...

The correlation of residence time to reaction time is critical in the ability to treat the volume of the channel as a continuous gradient in molecular mass. ATRP is particularly well-suited to this type of device because the reaction can be initiated at a fixed mixing element at the head of the channel where a catalyst and initiator can be brought together. By replacing a small molecule initiator with a polymer chain capable of being reinitiated, copolymers could be prepared. This was done in the thiolene/glass devices with a poly(n-butyl methacrylate) block... 

Figure 8 (1., 6) shows the fractionation obtained by analyzing a mixture of polystyrene, poly(styrene co-n-butyl methacrylate) and poly(n-butyl methacrylate) with various n-heptane concentrations. 

Figure 8 Two series of Orthogonal Chromatography runs showing the effec of % n-hept me in the mobile phase of SEC 2 on the fractionation (AA polystyrene, AB poly(styrene co-n-butyl methacrylate) BB poly n-butyl methacrylate). (Reproduced fran Ref. 6. Copyright 1983, American Chemical Society.)...

Figure 12 Effect of column reordering on polystyrene (AA) and poly (n-butyl methacrylate) (BB) retention in SBC 2. Key top, small pore size column last and bottom, small pore size column first. (Reproduced from Ref. 6. Copyright 1983,...

Figure 15. Influence of the Polyester Yellow dye film absorbance and polymer binder material on the marking threshold energy. PnBMA = poly(n-butyl methacrylate) PiBMA = poly(isobutyl methacrylate) PS = polystyrene PsBMA = poly (sec-butyl methacrylate) PVB = polyvinylbutyl PMMA = polymethyl methacrylate PVAC = polyvinylacetate, S-iBMA = poly(styrene-co-isobutyl methacrylate), PC = polycarbonate S-AN — poly(styrene-co-...

Circular surface micelles have also been observed for non-ionic block copolymers. Li et at. (1993) reported TEM and AFM of starfish micelles formed by PS-poly(n-butyl methacrylate), PS-poIy(rm-butyl methacrylate) and poly(fer<-butyl acrylate) diblock copolymers. Plateaus observed in surface/area isotherms of the Langmuir-Blodgett films at the air-water interface were consistent with the formation of surface micelles. 

Integral adsorption enthalpies AH for the adsorption of poly(vinyl acetate), poly(n-butyl methacrylate), and polycaprolactone from carbon tetrachloride solutions on Aerosil 200 silica were measured by Korn and Killmann98), who used IR spectroscopy for the determination of p. The values obtained for the three polymers exhibited the same characteristic dependence on adsorbance as that observed for poly(ethylene glycol). If the enthalpy of polymer-solvent and polymer-polymer interactions is neglected, the net binding adsorption enthalpy AHp A can be calculated from... 

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. 

See color plate) Strut-associated inflammation in response to the polyethylene-co-vinyl acetate—poly-n-butyl methacrylate polymers in porcine and canine models at two months. Source Adapted from Ref. 60. 

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... 

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. 

C 8 — and R. A. Guzzi Poly-n-butyl-methacrylate. III. Dilute solution properties by viscosity and light scattering. J. Polymer Sci. 21, 417 (1956). 

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