The chemical modification of polymers for analytical purposes

Harwood, H. James

doi:10.1002/apmc.1968.050040113

Cited by 16 publications

(1 citation statement)

References 121 publications

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“…A Figure 2. CD spectrum of poly(N-methyl-7-methyl L-glutamate) (1); poly(lV-methyl-7-ethyl L-glutamate) (2); and polyUVmethyl-L-alanine) (3) (from ref 15) in TFE.…”

Section: Synthesis Of Poly(jv-methyl-7-methyl Glutamate)mentioning

confidence: 99%

N-Substituted Poly(α-amino acids). 1. Synthesis and Characterization of Poly(N-methyl-γ-methyl L-glutamate) and Poly(N-methyl-γ-ethyl L-glutamate)

Cosani¹,

Palumbo²,

Terbojevich³

et al. 1978

Macromolecules

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N-Substituted Poly(«-amino acids) 1041 stirring at 95 °C until it became homogeneous. This required less than 1 h. Freshly cut sodium metal (0.40 g, 0.018 mol) was then added, and the resulting pink reaction mixture was heated at 95 °C and stirred for 1.5 h. Approximately one-half of the excess phenol was then removed by vacuum distillation. The concentrated reaction mixture was allowed to cool to 40 °C and concentrated HC1 (10 mL) was added, slowly, with stirring. The resulting suspension was poured into 20 volumes of methanol to precipitate the polymer, which was then washed with methanol and dried in vacuo. The yield was 0.54 g. Most of this sample was rephenylated, using the procedure described above, but a portion of it was reprecipitated from acetone into methanol, and then dried in vacuo. The infrared spectrum of this portion contained a strong absorption band at 1702 cm4. A portion of this sample was methylated with diazomethane.1 The NMR spectrum of the resulting product contained a strong resonance at ~3.5. Its intensity indicated that approximately 11.5% of the units were methyl methacrylate units.

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“…A Figure 2. CD spectrum of poly(N-methyl-7-methyl L-glutamate) (1); poly(lV-methyl-7-ethyl L-glutamate) (2); and polyUVmethyl-L-alanine) (3) (from ref 15) in TFE.…”

Section: Synthesis Of Poly(jv-methyl-7-methyl Glutamate)mentioning

confidence: 99%

N-Substituted Poly(α-amino acids). 1. Synthesis and Characterization of Poly(N-methyl-γ-methyl L-glutamate) and Poly(N-methyl-γ-ethyl L-glutamate)

Cosani¹,

Palumbo²,

Terbojevich³

et al. 1978

Macromolecules

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Polyélectrolytes optiquement actifs à hydrophobie variable, 1. Copolymères amide‐acide acryliques obtenus par hydrolyse contrǒlée des (±), (+) et (−) poly[N‐(sec‐butyl)‐N‐méthyl‐acrylamides]

Braud

Vert

1974

Makromol. Chem.

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On hydrolyse progressivement en milieu acide (CH3COOH + HCl) les (±), (+) et (−) poly‐[N‐(sec‐butyl)‐N‐méthylacrylamide] (1) obtenus par polymérisation radicalaire des (±), (−) et (+) N‐(sec‐butyl)‐N‐méthylacrylamides (AAM). On obtient une série de copolymeères (2) consititués de motifs hydrophobes dérivés de AAM et de motifs hydrophiles dérivés de l'acide acrylique (AA) répartis statistiquement et en proportion variable selon le temps d'hydrolyse. La viscosité, le pouvoir rotatoire dans le méthanol, la solubilité dans divers solvants, les spectres IR à l'état solide et la dispersion de la rotation optique (ORD) sont étudiés en fonction du taux d'hydrolyse. Pour interpréter l'évolution de l'ORD et des spectres IR on a supprimé les interactions H entre groupes amide et acide par méthylation de ces derniers au diazométhane. Au cours de la neutralisation des différents copolymères 2 par KOH, on constate que l'augmentation de la proportion des parties hydrophobes par rapport aux parties hydrophiles modifie fortement l'ionisation des groupes COOH des motifs monomères dérivés de l'acide acrylique.

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Synthèse par voie radicalaire de polymères à extrémités hydroxylées, 12. Etude de la copolymérisation du méthacrylate de méthyle avec divers acrylates et méthacrylates. Détermination des microstructures

1983

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Methyl methacrylate was copolymerized with butyl or isobutyl acrylates, and butyl, isobutyl, or 2,3-epoxypropyl methacrylates, by hydrogen peroxide, in the presence of ethanol under UV irradiation (at 254 nm) at room temperature. The analysis of the microstructures was based on resonance splitting of the methoxy protons of MMA, depending on their environment. This splitting was not obtained with isobutyl and 2,3-epoxypropyl methacrylates. All the products were found to be predominantly syndiotactic.

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The chemical modification of polymers for analytical purposes

Cited by 16 publications

References 121 publications

N-Substituted Poly(α-amino acids). 1. Synthesis and Characterization of Poly(N-methyl-γ-methyl L-glutamate) and Poly(N-methyl-γ-ethyl L-glutamate)

N-Substituted Poly(α-amino acids). 1. Synthesis and Characterization of Poly(N-methyl-γ-methyl L-glutamate) and Poly(N-methyl-γ-ethyl L-glutamate)

Polyélectrolytes optiquement actifs à hydrophobie variable, 1. Copolymères amide‐acide acryliques obtenus par hydrolyse contrǒlée des (±), (+) et (−) poly[N‐(sec‐butyl)‐N‐méthyl‐acrylamides]

Synthèse par voie radicalaire de polymères à extrémités hydroxylées, 12. Etude de la copolymérisation du méthacrylate de méthyle avec divers acrylates et méthacrylates. Détermination des microstructures

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