摘要:

AbstractFunctional polymers, i.e. synthetic or artificial polymers substituted with specific chemical groups borne by the macromolecular chain, interact specifically with living systems. Typical functional polymers derived from polystyrene and dextran are reviewed. First, antithrombogenic heparin‐like polymers interact specifically with serine‐proteases involved in the coagulation cascade. They have anticoagulant properties. Second, functional polymers have been tailored in order to interact specifically with components of the immune system. Third, some functional polymers are able to interact with ce

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390701

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractIn order to find a series of monomers with high reactivities in copolymerization and still undergo free radical ringopening polymerization, a series of cyclic acrylates were synthesized and polymerized to insert a pyruvate ester into the backbone of the polymer. In order to discover groups other than the carbonyl groups and strained rings that would promote free radical ring‐opening polymerization, a series of spiro methylenecyclohexadienes were prepared and polymerized to give a polymer with a p‐phenylene group in the backb

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390702

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractA classical treatment of fluid phase separations in polymeric systems puts individual experimental data into a wider perspective and allows general relationships to be recognized. Pressure, an important variable in polymer production and processing, is dealt with by simple extensions of existing molecular models capable of covering known data and predicting other properties in a reasonably accurate manner. Disparity in size and shape between molecules and/or repeat units implies differences in numbers of nearest‐neighbour contacts. This molecular feature is found to be of primary importance when it comes to match model equations to data, for polymer solutions as well as polymer mixtures. The influence of flow on the thermodynamic stability of polymeric systems is discussed briefl

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390703

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractAs a continuation of the thermochemical analysis of the cationic polymerization, the initiation as well as the transfer and termination reactions were thermodynamically treated as competing reactions to the cationic propagation using recent data for the formation enthalpies of the carbocations.

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390704

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractThe radical copolymerization of methyl acrylate and styrene initiated by imidazolium‐p‐chlorophenacylide has been studied. The reaction orders with respect to initiator and monomer concentrations, and the energy of activation were determined. By NMR spectroscopy is shown that alternating copolymers resul

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390705

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractThe reaction of the OH radical with some carboxylic and hydroxycarboxylic acids was investigated by trapping the resultant radicals as endgroups of poly(methyl methacrylate), which were detected and estimated by the sensitive dye partition technique. The rate constants of the reaction at 25°C andpH = 1.0 with formic, propionic, butyric, valeric, lactic, and tartaric acids were determined. The increasing reactivity of the acids with increasing chain length is explained by the decreasing deactivation of the CH2group, from which H‐abstraction occurs, by the preceding COOH group. The higher reactivity of formic acid than acetic or propionic acid, and the higher reactivity of lactic acid than propionic acid are explained by the increased electron density at the site of H‐abstrac

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390706

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractBy means of IR spectroscopy the structural modifications appearing during the synthesis, drying and spinning of some acrylonitrile copolymers containing vinyl acetate, α‐methyl‐styrene, cinnamic acid, acrylates, and monofumarates have been studied. The results are discu

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390707

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractThe copolymerization of maleic anhydride (MA), N‐2‐chlorophenyl maleimide (2‐CMI) and N‐α‐naphthyl maleimide (α‐NMI) with styrene (ST) initiated by α‐radiation has been studied. The initial rate of copolymerization depends on the total concentration of the comonomers, and the rate decreases in the series ST/MA>ST/α‐NMI>ST/2‐CMI. The maximum rate occurred at a ratio for which [M2]>[ST]. The rate of formation and the reaction ofm 1˙is greater thanm 2˙. The monomer reactivity ratios indicate that the ratio of alternating units decreases in the or

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390708

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractDie mit dem komplexkoordinativen Katalysatorsystem Nickeloctoat/Bortrifluoridetherat/Aluminiumtriethyl ausgelöste Butadienpolymerisation im Lösungsmittel Benzen wurde hinsichtlich des Einflusses von Monomerkonzentration und Polymerisationszeit untersucht. Es sollte somit die Möglichkeit erarbeitet werden, die hierbei erhaltenen Ergebnisse mit denen in anderen Lösungsmittelsystemen zu vergleic

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390709

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY

摘要:

AbstractPoly(ethylene oxide) dyed with active dyestuffs is prepared. The polymer with chemically bound dye shows increased thermoresistance. Its crystalline structure and morphology depend on the quantity of bound dyestuff.

ISSN:0323-7648    

DOI:10.1002/actp.1988.010390710

出版商:Akademie Verlag GmbH    

年代:1988

数据来源: WILEY