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Showing 1 to 20 of 39 for “"methyl acrylate"”.
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Determination of Reactivity Ratios for Acrylonitrile/Methyl Acrylate Radical Copolymerization Via Nonlinear Methodologies Using Real Time FTIR
… initiated copolymerization of acrylonitrile and methyl acrylate were measured by NMR on isolated, low conversion copolymers and by real time in situ FTIR. The system utilized azobisisobutyronitrile (AIBN) initiator in dimethyl formamide (DMF) at 62°. The FTIR technique allowed rapid generation of …
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Síntese de novos adutos de Morita-Baylis-Hillman com potencial atividade biológica.
… was synthesized AMBH 8 using the 2-hydroxyethyl Acrylate 45 as Michael acceptor, giving the adducts 47 (2-hydroxyethyl [2-(hy-droxy(2-nitrophenyl)methyl)] acrylate, 71%), 48 (2-hydroxyethyl [2-(hydro- xy(3-nitrophenyl)methyl)] acrylate, 50%), 49 (2-hydroxyethyl [2-(hydroxy(4-nitrophenyl)methyl)] …
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Copolymerizing Acrylonitrile and Methyl Acrylate by RAFT for Melt Processing Applications: A Synthetic Investigation of the Effects of Chain Transfer Agent, Initiator, Temperature, and Solvent
Statistical copolymers of acrylonitrile (AN) and methyl acrylate (MA) were successfully prepared and characterized using reversible addition-fragmentation chain transfer (RAFT) copolymerization. A typical copolymer was charged with 15 wt. % MA content. This thesis describes a systematic variation …
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Synthesis and Characterization of Solution and Melt Processible Poly(acrylonitrile-co-methylacrylate) statistical copolymers
… very high molecular weight poly(acrylonitrile-co-methyl acrylate) copolymers with weight average molecular weights of at least 1.7 million g/mole were synthesized on a laboratory scale using low temperature, emulsion copolymerization in a closed pressure reactor. Single filaments were spun via …
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The synthesis of amphiphilic diblock copolymers: An investigation into the formation of micelles as a function of hydrophobic block length
<p>Acrylate-based amphiphilic diblock copolymers show great potential for anti-cancer drug transport due to their ability to aggregate into protective core-shell micelles. Using RAFT polymerization, copolymers containing poly(acrylic acid) and poly(methyl acrylate) blocks were made with high …
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Synthetic Studies Towards Mescengricin
… scaffold 287 was afforded after heating 259 with methyl acrylate. Deprotection of the indole nitrogen to 288 was thought to favour this aza-Diels-Alder reaction, however, 289 was produced. Establishing a route to construct the ɑ-carboline scaffold led us to pursue the same route with 298. …
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Synthesis, Characterization, Processing and Physical Behavior of Melt-Processible Acrylonitrile Co- and Terpolymers for Carbon Fibers: Effect of Synthetic Variables on Copolymer Synthesis
… and has a typical composition of acrylonitrile/ methyl acrylate/acryloyl benzophenone in the molar ratio of 85/14/1. This thesis describes a systematic variation of the polymerization variables in the emulsion polymerization which may further enhance the system. In particular, the effects of …
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Polymer dynamics in bulk, adsorbed and solution by NMR methods
… adsorbed polymers. Segmental dynamics of poly(methyl acrylate) is examined in bulk and when adsorbed to anopore, alumina and silica as a function of temperature. The second part investigates diffusion of small molecules in polymer solutions by pulsed field-gradient proton nuclear magnetic …
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Investigations of Structure–Property Relationships in Semicrystalline Thermoplastic Polymers: Blown Polyethylene Films and Polyacrylonitrile Copolymers
… properties of novel poly(acrylonitrile-co-methyl acrylate) materials. Five polymers were studied with methyl acrylate (MA) content varying between 0 and 15 mol%. The MA decreased both the glass transition and melting temperatures. Melting point depression was sufficient in the two highest …
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Mechanophore-Linked Polymers for Studying Mechanochemical Response
… to synthesize mechanophore-linked poly(methyl acrylate) in an efficient manner using single electron transfer living radical polymerization (SET-LRP). The utility of this method was demonstrated with a spiropyran (SP) mechanophore that was found to undergo a mechanically induced …
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Preparation and Cycloaddition Reactions of Oxazoline Nitrogen Oxides
… conditions by condensation of 2-(hydroxyamino)-2-methyl-1-propanol with ortho esters or amide acetals. 3 + 2 Cycloaddition reactions of the oxazoline N-oxides and the related pyrroline N-oxides with phenyl isocyanate, dimethyl acetylenedicarboxylate, methyl phenylpropiolate, phenylpropiolonitrile, …
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Preparation and reactions of some organic derivatives of manganese carbonyl compounds
… (13) and η²-(4-acetyl-2,5-dimethylthien-3 yl) tetracarbonylrhenium (32) are reported. Reactions of orthomanganated aryl ketones with SO₂ and with the electronically and structurally related cumulenes, N-sulfinylaniline (PhN=S=O), N-sulfinylbenzenesulfonamide (PhS(O)₂N=S=O) and …
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Towards polyethylene-based materials with non-alternatively incorporated carbon monoxide monomer
… the complexation of (TMEDA)NiMe2 (N,N,N′,N′-tetramethylethylenediamine nickel(II) dimethyl) with either a BINOL (1,1′-bi-2-naphthol)-based phosphine diphenol (P,O) ligand or an analogous ligand which features an ethyl ether in place of the nonortho phenol. All complexes were active for ethylene …
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Design of PolyMOCs and the synthesis of crosslinkers for the BASP platform
… a different type of polyMOC. In this case, poly(methyl acrylate) (PMA) homopolymers are synthesized from initiators featuring a diene or dienophile on one end and functionalized with a bispyridyl ligand on the other end. Diels-Alder (DA) cycloaddition is used in the second step to create a …
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Some chemistry of orthomanganated ketones
… (3); 4,5,6-trimethoxy (4); 3-t-butyldimethylsiloxy-4,5-dimethoxy (5); 4,5-dimethoxy (6); 5,6-dimethoxy (7); 3-benzyloxy-4,5-dimethoxy (8); and 3-t-butyldimethylsiloxy (9). Hetero aromatic ketones have been used to prepare the corresponding orthomanganated compounds (10), (11), (12), …
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Precursors for perylene diimide dendrimers : synthesis and photophysics
… steps, PDI1.5 compounds were synthesized using methyl acrylate and acrylonitrile with PDI1.0. Their photophysics in solutions was studied by UV and fluorescence spectra as a function of added trifluoroacetic acid (TFA). Previous work in laboratory has demonstrated that TFA can greatly enhance …
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Investigation of Copper Wire-Mediated Controlled/Living Radical Polymerization
… Polymerization of low molecular weight poly(methyl acrylate) (PMA) with bromine chain-end functionality was initiated by ethyl 2-bromoisobutyrate (EBiB). Two effective green solvent systems were established, 75-25 PEG-Ethanol and 75-25 PPG-Ethanol. Both provide good control over …
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Heterocycles in peptide chemistry
… group could easily be incorporated by use of methyl acrylate as the dipolarophile, it proved impossible to attach an amine group to the ring using this methodology. However, by using one of the nitrogen atoms in the ring as the N-terminus, two pyrazolidines with protected amine and carboxylic …
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Effect of structure and plasticizer on the glass transition of adsorbed polymer
<p>"The effect of molecular mass on adsorbed poly(methyl methacrylate) (PMMA) on silica was determined using temperature-modulated differential scanning calorimetry (TMDSC). A two-component model, based on loosely-bound polymer (glass transition temperature, T<sub>g</sub>, similar to that of bulk) …
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Ensemble and single molecules fluorescence studies of polymers
… process. Rotational dynamics of poly(methyl acrylate) is investigated by single molecule spectroscopy. Polarized fluorescence transients from single rhodamine 6G dye embedded in polymer matrix above glass transition are analyzed and the correlation function of reduced linear dichroism …
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