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1. |
Etherification of poly(oxymethylene)‐diol [α‐hydro‐ω‐hydroxypoly(oxymethylene)] with orthoesters in the presence of Lewis acids |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 1-10
Paolo Colombo,
Pierino Radici,
Sergio Custro,
Mario Ermoni,
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摘要:
AbstractAttempts were made to elucidate experimentally the behaviour of poly(oxymethylene)‐diol [α‐hydro‐ω‐hydroxypoly(oxymethylene)] in the etherification reaction in order to explain the decrease of the polymer molecular weight compared with that of the starting product and in order to determine the type of terminal groups and how the thermal resistance and alkali stability can be affected. In fact one finds that, in addition to the wanted terminal ether groups, formyl and orthoformyl (dialkoxymethyl) groups are formed having a different chemical resistance in comparison to that of the pure ethers, particularly in ba
ISSN:0025-116X
DOI:10.1002/macp.1977.021780101
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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2. |
The microtacticity of poly(acrylic esters) |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 11-17
Kei Matsuzaki,
Toshiyuki Uryu,
Taiichi Kanai,
Kunihiko Hosonuma,
Tetsuyuki Matsubara,
Hiromichi Tachikawa,
Masai Yamada,
Shuichi Okuzono,
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摘要:
AbstractSeveral acrylic esters were polymerized with radical and anionic initiators and the stereoregularity of the polymers was determined. The radical polymerization oftert‐butyl acrylate gave syndiotactic‐rich polymers at low temperatures as did isopropyl and trimethylsilyl acrylates. A radically obtained polymer of triphenylmethyl acrylate was atactic in contrast to poly(triphenylmethyl methacrylate). In the anionic polymerization with phenylmagnesium bromide or butyllithium as catalyst, the stereoregularity of the polymers was governed by the coordination of the catalyst which depends on the polarity and bulkiness of ester groups, the polarity of solvents, and the temperature in the polymerizat
ISSN:0025-116X
DOI:10.1002/macp.1977.021780102
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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3. |
Reaktion an Ziegler‐Natta‐Katalysatoren, 12.Anwendung der Olefin‐Metathese zum Nachweis einer radikalischen Aralkylierung von 1,4‐Polybutadien |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 19-27
Klaus Hummel,
Hans Demel,
Dieter Wewerka,
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摘要:
Abstract1,4‐Polybutadien wurde mit Alkylbenzolen (Toluol, Äthylbenzol,o‐, m‐ undp‐Xylol, Mesitylen) und Dicumylperoxid in einer radikalischen Reaktion partiell aralkyliert. Die erhaltenen Polymeren wurden IR‐spektroskopisch untersucht und durch Metathese mit 4‐Octen unter Verwendung eines WCl6/Sn(CH3)4‐Katalysators abgebaut. Die niedermolekularen Abbauprodukte mit Aralkylsubstituenten wurden gaschromatographisch getrennt und massenspektrometrisch
ISSN:0025-116X
DOI:10.1002/macp.1977.021780103
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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4. |
Effect of some additions on the aqueous polymerization of acrylamide, initiated by permanganate‐oxalic acid redox system |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 29-36
Md. Mukhtar Husain,
Archana Gupta,
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摘要:
AbstractThe effect of different additives on the aqueous polymerization of acrylamide, initiated by MnO −4‐oxalic acid redox pair, was studied at 25°C in an atmosphere of nitrogen. It was observed that the rate of polymerization increased in the presence of alkali metal (Li+to Rb+) chlorides. Cupric chloride and ferric chloride were found to be polymerization retarders. Anionic and cationic detergents showed marked influence on the rate of polymerization. Also, the presence of water‐soluble alcohols lowered the polymerization rates to a sufficien
ISSN:0025-116X
DOI:10.1002/macp.1977.021780104
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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5. |
Interaction between dyes and polyelectrolytes, 2.Structural effect of polyanions on the methylene blue binding |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 37-46
Masamitsu Shirai,
Tatsuki Nagatsuka,
Makoto Tanaka,
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摘要:
AbstractThe structural effect of polyanions on the binding type of methylene blue (1) was investigated spectrophotometrically.1was bound to poly(potassium styrenesulfonate) (PSS) and poly(sodium 4‐vinylphenylsulfate) (SVS) in the dimeric or slightly aggregated form and to poly(sodium vinylsulfonate) (SVF) and poly(potassium vinyl sulfate) (PVS) in the highly aggregated (polymeric) form. It was found that the flexibility of polyanions plays an important rǒle in the aggregation of bound1and that the difference between SO −3and OSO −3as binding site is not a sign
ISSN:0025-116X
DOI:10.1002/macp.1977.021780105
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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6. |
Organozinc catalyst systems for the copolymerization of carbon dioxide with propylene oxide |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 47-54
Witold Kuran,
Stanisław Pasynkiewicz,
Jadwiga Skupińska,
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摘要:
AbstractA series of new catalytic systems: (C2H5)2Zn/polyhydric phenols was prepared and their activity in the alternating copolymerization of carbon dioxide with propylene oxide (epoxypropane) was studied. On the basis of the results obtained, the structure of organozinc compounds formed in these systems and also in others described in the literature is proposed and discussed. It is shown that the presence of an internal coordinative bond in the catalyst molecule is responsible for its activity in copolymerization.
ISSN:0025-116X
DOI:10.1002/macp.1977.021780106
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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7. |
Über die homopolymerisation desN‐(pentachlorphenyl)maleinimids und desN‐(2,4,6‐tribromphenyl)maleinimids |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 55-68
Karel Bouchal,
Miroslav Ryska,
František Hrabák,
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摘要:
AbstractNew monomers with a high content of halogens,N‐(pentachlorophenyl) maleimide (1) andN‐(2,4,6‐tribromophenyl) maleimide (2) were prepared. The products of their radical polymerization consist of oligomers. Of these, products with the degree of oligomerization, n, ranging from 1–4 and from 1 to 3 were separated on a gel chromatograph for1and2, respectively. Their structures were determined from the mass spectra. The elution volumesVnof the individual oligomers were found to be a linear function of logMn. The radical polymerization mechanism of1and2is discussed on the basis of the character of ol
ISSN:0025-116X
DOI:10.1002/macp.1977.021780107
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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8. |
Ring inversion in ap‐alkylphenol‐formaldehyde cyclic tetracondensate |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 69-74
John H. Munch,
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摘要:
AbstractThe temperature‐dependent1H NMR spectrum of cyclo{tetrakis[(2‐hydroxy‐5‐(1,1,3,3‐tetramethylbutyl)‐1,3‐phenylene)methylene]}1e, a 4‐(1,1,3,3‐tetramethylbutyl)phenolformaldehyde cyclic tetracondensate, is described. From this the activation parameters in chloroform at 25°C for ring inversion (turning the pyramid inside out) of the truncated pyramid conformation of1ewere calculated: ΔG≠= 16,03 kcal/mol (67,1 kJ/mol), ΔH≠= 26,1 kcal/mol (109 kJ/mol), and ΔS≠= 34 cal mol−1K−1(141 J mol−1K−1). The1H NMR spectrum of the corresponding tetraacetate2was found to be ess
ISSN:0025-116X
DOI:10.1002/macp.1977.021780108
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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9. |
New catalysts for the oxidative polymerization of 2,6‐dimethylphenol, 2.Copper complexes containing the dicyanoethenedithiolatocuprate structure as the ligand |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 75-96
Tamotsu Yoshimura,
Winfried Storck,
Georg Manecke,
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摘要:
AbstractIt was found that the reaction of 1,2‐dicyano‐1,2‐ethenedithiolate, resp. of bis(1,2‐dicyano‐1,2‐ethenedithiolato)cuprate(2‐), with Cu2+does not lead to copper bis(1,2‐dicyano‐1,2‐ethenedithiolato)cuprate(2‐) dihydrate (1a) as described in the literature but to a reaction product which has a complex structure containing mainly Cu+. This compound as well as complexes with the same ligand, but with Cu+, Cu2+or Cu3+as the central atom, were synthesized and tested with and without added cuprous chloride as catalysts for the oxidative polymerization of 2,6‐dimethylphenol. Included in this investigation were some copper complexes with the isomeric ligand 2,2‐dic
ISSN:0025-116X
DOI:10.1002/macp.1977.021780109
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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10. |
New catalysts for the oxidative polymerization of 2,6‐dimethylphenol, 3.Copper(I) cluster complexes |
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Die Makromolekulare Chemie,
Volume 178,
Issue 1,
1977,
Page 97-106
Tamotsu Yoshimura,
Winfried Storck,
Georg Manecke,
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摘要:
AbstractThe catalytic activities of various copper(I) clusters in the oxidation of 2,6‐dimethylphenol (XOH) in pyridine and the preparative oxidative polymerization of XOH with these complexes were investigated. It was found that the copper(I) cluster containing 1,2‐dicyano‐1,2‐ethenedithiolate ligands is more effective in the oxidative polymerization of XOH than the complex containing isomeric ligands. The electric conductivities of these Cu(I) complexes ar
ISSN:0025-116X
DOI:10.1002/macp.1977.021780110
出版商:Hüthig&Wepf Verlag
年代:1977
数据来源: WILEY
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