Polyacetale mit reaktiven gruppen

Weissermel, Von K.; Fischer, E.; Häfner, Karl-Heinz; Cherdron, Harald

doi:10.1002/apmc.1968.050040108

Cited by 19 publications

(7 citation statements)

References 10 publications

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“…Several modified‐POM samples have been prepared, containing a variety of reactive groups as side chain branches from the main polymer backbone and as terminal groups on the polymer chain 14–20. Wissbrun reported that the POM copolymer of trioxane with epichlorohydrin comonomer reacted with thioglycolate to give modified‐POM with carboxylic derivatives 19.…”

Section: Introductionmentioning

confidence: 99%

Polymerization of trimethylene carbonate in aqueous solutions: Reaction mechanism and characterization

Okada¹,

Imamura²,

Matsuda

2010

J. Polym. Sci. A Polym. Chem.

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Polymerization of a trimethylene carbonate (TMC) in an aqueous solution was investigated by gel permeation chromatography, Fourier transform infrared spectroscopy, and nuclear magnetic resonance. The polymerization reaction proceeded rapidly in the aqueous solution and high conversion was achieved in a relatively short time. 1,3‐Propanediol (PPD) formed by hydrolysis of TMC was used as the initiator. The TMC oligomer obtained by ring‐opening polymerization had a TMC unit backbone with terminal 3‐hydroxypropyl groups at both chain ends. The oligomer underwent transesterification reaction with elimination of PPD, resulting in a gradual increase in the molecular weight of the product. The molecular weight was affected by the concentration of TMC. The thermal properties of the polymers were investigated by differential scanning calorimetry. Polymers within the molecular weight (Mn) range from 6.0 × 103 to 2.3 × 104 g/mol crystallized, and endothermic peaks corresponding to the melting temperature were observed. The glass transition temperature increased with the molecular weight of the polymers. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 1485–1492, 2010

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Section: Introductionmentioning

confidence: 99%

Polymerization of trimethylene carbonate in aqueous solutions: Reaction mechanism and characterization

Okada¹,

Imamura²,

Matsuda

2010

J. Polym. Sci. A Polym. Chem.

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“…The results provide possibilities for further and comprehensive improvements in the compatibility with glass binders and, therefore, the mechanical properties of glass‐fiber‐filled POM. Additionally, several modified POM samples have been prepared containing a variety of reactive groups as side‐chain branches from the main polymer backbone and as terminal groups on the polymer chain 17–23. Wissbrun22 reported that a POM copolymer of TOX with epichlorohydrin as a comonomer reacted with thioglycolate to produce a modified POM with carboxylic derivatives.…”

Section: Introductionmentioning

confidence: 99%

Tensile behavior of glass‐fiber‐filled polyacetal: Influence of the functional groups of polymer matrices

Kawaguchi¹,

Masuda²,

Tajima³

2007

J of Applied Polymer Sci

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We investigated the tensile behavior of glass-fiber-filled polyacetal [i.e., polyoxymethylene (POM)], focusing on the mutual influence of the functional groups in the POM matrices and the glass binder system. The different POM matrices were compounded with three kinds of glass fibers (20 wt %) treated with different glass binders, namely, epoxy resin, thermoplastic polyurethane (TPU), and a mixture of TPU and epoxy resin. A good correlation between the tensile strength and elongation at break was observed, regardless of the difference in the glass binders. The composites based on the modified POM matrix, which had both a carboxyl end group and a hydroxyl end group, improved the tensile properties noticeably in comparison with those based on the normal POM matrix. The composites were strengthened with an increase in the concentration of the functional groups. The results of scanning electron microscopy observations indicated that the fractured surfaces of a specimen having maximum tensile strength and elongation exhibited cohesion of the modified POM on the surfaces of the glass fibers.

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“…3-(l,2-Diacetoxyethyl)-a-benzyl-tert-buty lamino-4benzyloxyacetophenone (16). A solution of 15 (4.40 g, 9.8 mmol) and tert-butylbenzylamine (3.04 g, 18.6 mmol) in 50 mL of MeCN was refluxed for 3.5 h. To the chilled solution was added 100 mL of Et^O, and the insoluble material was filtered. The filtrate was concentrated to leave a residue which was chromatographed on an alumina column (eluted with CHCl3-hexane 3:2).…”

Section: -Benzyloxy-3-(l2-dihydroxyethyl)acetophenone (14a)mentioning

confidence: 99%

Adrenergic agents. 6. Synthesis and potential .beta.-adrenergic agonist activity of some meta-substituted p-hydroxyphenylethanolamines related to salbutamol

Jen¹,

Frazee²,

Kaiser³

et al. 1977

J. Med. Chem.

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Salbutamol, an adrenergic receptor agonist with selectivity for tracheobronchial vs. cardiac muscle, differs from the catecholamine N-tert-butylnorepinephrine in that it bears a hydroxymethyl, rather than a phenolic, group in the meta position. In a search for new bronchodilating agents with minimal cardiovascular side effects, a series of derivatives, in which this m-hydroxymethyl group is modified, was prepared. These compounds were examined for potential bronchodilator activity in an in vitro test that measures relaxation of guinea pig tracheal smooth muscle. Potential cardiac stimulant activity was evaluated in vitro by monitoring changes in the rate of contraction of spontaneously beating guinea pig right atria. Although many of these compounds retained a high degree of potency, all were less effective than salbutamol in the tracheal test. Several of the derivatives, notably ones bearing 1-hydroxyethyl (1d), 1,2-dihydroxyethyl (1f), 1-hydroxy-2-methoxyethyl (1g), and 2-hydroxy-1-methoxyethyl (1h) substituents in place of the parent's m-hydroxymethyl group, however, were considerably more selective for tracheobronchial vs. cardiac muscle in the in vitro tests utilizing guinea pig tracheal and right atrial muscle.

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Polyacetale mit reaktiven gruppen

Cited by 19 publications

References 10 publications

Polymerization of trimethylene carbonate in aqueous solutions: Reaction mechanism and characterization

Polymerization of trimethylene carbonate in aqueous solutions: Reaction mechanism and characterization

Tensile behavior of glass‐fiber‐filled polyacetal: Influence of the functional groups of polymer matrices

Adrenergic agents. 6. Synthesis and potential .beta.-adrenergic agonist activity of some meta-substituted p-hydroxyphenylethanolamines related to salbutamol

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