Reactions of poly(phenylene oxide)s with quinones. I. The quinone-coupling reaction between low-molecular-weight poly(2,6-dimethyl-1,4-phenylene oxide) and 3,3′,5,5′-tetramethyl-4,4′-diphenoquinone

1981 ◽  
Vol 19 (6) ◽  
pp. 1367-1383 ◽  
Author(s):  
Dwain M. White
Keyword(s):  
Molecular Weight ◽  
Coupling Reaction ◽  
Low Molecular Weight ◽  
Phenylene Oxide

Reactive blend of epoxy-novolac resin and epoxide-terminated low-molecular-weight poly(phenylene oxide)

2012 ◽  
Vol 127 (6) ◽  
pp. 4879-4888 ◽  
Author(s):  
Jingzhao Mo ◽  
Lei Xia ◽  
Pengju Pan ◽  
Baoqing Shentu ◽  
Zhixue Weng
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Novolac Resin ◽  
Phenylene Oxide ◽  
Reactive Blend

Block Copolymers Poly(2,6-dimethyl-1,4-phenylene oxide)-poly(6-hexanelactam). Preparation and Composition

1993 ◽  
Vol 58 (11) ◽  
pp. 2574-2582 ◽  
Author(s):  
Jaroslav Stehlíček ◽  
Rudolf Puffr
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Diblock Copolymer ◽  
Anionic Polymerization ◽  
Diblock Copolymers ◽  
Toluene Solution ◽  
Low Molecular Weight ◽  
Phenylene Oxide ◽  
End Groups ◽  
Tolylene Diisocyanate

Poly(2,6-dimethyl-1,4-phenylene oxide)-poly(6-hexanelactam) diblock copolymers were prepared from low-molecular weight poly(2,6-dimethyl-1,4-phenylene oxide) by transforming its phenolic end groups via the reaction with 2,4-tolylene diisocyanate and 6-hexanelactam to polymeric initiators and the subsequent anionic polymerization of 6-hexanelactam. The polymerization of 6-hexanelactam was carried out in bulk or toluene solution. The content of the 6-hexanelactam homopolymer was estimated by TLC showing that the pure diblock copolymer can be prepared in toluene. The reason for relatively low yields is discussed.

Immbilization on cellulose in bead form after periodate oxidation and reductive alkylation

1979 ◽  
Vol 44 (11) ◽  
pp. 3411-3417 ◽  
Author(s):  
Jaroslava Turková ◽  
Jiří Vajčner ◽  
Drahomíra Vančurová ◽  
Jiří Štamberg
Keyword(s):  
Molecular Weight ◽  
Covalent Binding ◽  
Periodate Oxidation ◽  
Coupling Reaction ◽  
Low Molecular Weight ◽  
Cellulose Derivatives ◽  
Cellulose Oxidation ◽  
Immobilized Trypsin ◽  
The Stability ◽  
Hydrolysis Of

The covalent binding of trypsin to cellulose beads after periodate oxidation was examined. The degree of cellulose derivatives solubilization is directly related to cellulose oxidation and increases with the increasing pH of the reaction mixture. The quantity of trypsin immobilized was examined as a function of pH, reaction time, and concentration of native trypsin in the reaction mixture during the coupling reaction. The catalytic activity and the stability of the preparations of immobilized trypsin during continuous hydrolysis of low-molecular-weight and high-molecular-weight substrates was assayed.

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