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1. |
Synthesis of novel ordered poly(ester‐amide)s |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 1-7
Jayalakshmi Gopal,
Mahalingam Srinivasan,
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摘要:
AbstractFive different completely aromatic, ordered poly(ester‐amide)s6a — ewere prepared from diphenols5and 4,4′‐carbonyliminodibenzoyl dichloride (3). This bifunctional “amide‐acid chloride” was synthesized in two steps by oxidation of 4,4′‐dimethylbenzanilide (1) with permanganate under neutral conditions and subsequent reaction with thionyl chloride. The polymers obtained were characterized by IR spectroscopy and viscosity measurements. Their physical properties like density, solubility, and thermal behaviour
ISSN:0025-116X
DOI:10.1002/macp.1986.021870101
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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2. |
Polymers with tertiary amino groups obtained by the reaction between chloromethylated polystyrene and 3‐alkylaminopropionitrile |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 9-22
Stela Drǎgan,
Virgil Bǎrboiu,
Doina Csergö,
Ioan Petrariu,
Mihai Dima,
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摘要:
AbstractPolymers with tertiary amino groups were obtained by reaction of chloromethylated polystyrene (CMPS) with 3‐alkylaminopropionitriles (2a — e). The resulting polymers3a — ewere characterized by elemental analyses, IR and1H NMR spectra. Kinetic investigation showed that the reaction is characterized by two rate constants, the rate change taking place at a conversion of 45–50%. Viscosimetric studies of the hydrochlorides of polymers3a — ein water and methanol showed that they behave as polyelectrolytes only in methanol. The abnormal behaviour of water solutions was explained by hydrolysis reaction. To prove the conclusions on the molecular structures of3a — eand the reactivity of CMPS, a study of the reaction of benzyl chloride with the same amines wa
ISSN:0025-116X
DOI:10.1002/macp.1986.021870102
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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3. |
Soluble poly(divinylbenzene): Reaction mechanism for the anionic polymerization of divinylbenzene with lithium diisopropylamide as catalyst |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 23-37
Yukio Nagasaki,
Hiromi Ito,
Teiji Tsuruta,
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摘要:
AbstractThis paper presents results of the studies on the mechanism of initiation, propagation and chain transfer reactions in the recently found polymerization of 1,4‐ and/or 1,3‐divinylbenzene (DVB), initiated with lithium diisopropylamide/diisopropylamine. Initiation was confirmed to take place by addition reaction of the alkylamino group to the DVB molecule. The population of the triad tacticity of the soluble poly(DVB) suggested the steric course of the polymerization to proceed according to Bernoullian statistics with respect to the diad placements,mandr. The chain transfer reaction was found to take place via the free amine, the chain transfer reactivity of a primary amine being higher than that of a secondary amine. Comparative studies on the reactivity and selectivity of sodium diisopropylamide toward styrene and DVB were also carried out with respect to lithium diisopropylamide as refere
ISSN:0025-116X
DOI:10.1002/macp.1986.021870103
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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4. |
Comparison of the cationic polymerization of octamethylcyclotetrasiloxane and hexamethylcyclotrisiloxane |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 39-51
Lech Wilczek,
Stawomir Rubinsztajn,
Julian Chojnowski,
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摘要:
AbstractSome features of the cationic polymerization of hexamethylcyclotrisiloxane (D3) and octamethylcyclotetrasiloxane (D4) in methylene chloride in the presence of a strong protonic acid (CF3SO3H) were compared. The polymerizations of both these monomers show many similarities, which are taken as evidence for analogies in their mechanisms. In particular, in both cases the reaction is affected by the addition of a small amount of water. The role of water is interpreted in terms of its direct participation in some elementary reactions of the process. The addition of water affects also the state of hydrogen bonding association in the system. Some experimental results together with comments concerning the mechanism of ring formation in the polymerization system are included.
ISSN:0025-116X
DOI:10.1002/macp.1986.021870104
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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5. |
Axially chiral catalysts for the preparation of optically active poly(triphenylmethyl methacrylate) |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 53-59
Shigeyoshi Kanoh,
Hiroshi Suda,
Naotaka Kawaguchi,
Masatoshi Motoi,
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摘要:
AbstractA variety of axially dissymmetric diphenylylene diamines1a — 1fwere synthesized and evaluated as chiral auxiliaries for the polymerization of triphenylmethyl methacrylate with organolithium compounds such as butyllithium and lithium (±)‐N‐(1‐phenylethyl)anilide in toluene at −78°C. The catalysts containing an optically active biphenylylene derivative of tetramethyl‐ethylenediamine (1e) were found to be particularly useful for the preparation of optically active poly(triphenylmethyl methacrylate) (PTrMA). The catalysts afforded tetrahydrofuran (THF)‐soluble polymers in high yields and the polymers showed large optical rotations arising from a one‐handed helical conformation of a polymer chain. (+)‐ and (‐)‐PTrMAs were obtained by using (S)‐1eand (R)‐1e, respectively. The poly(methyl methacrylate)s derived from these PTrMAs were almost completely isotactic, but showed negligible optical rotations. The other catalysts produced mainly polymers insoluble in organic solvents; the small amounts of THF‐soluble materials showed
ISSN:0025-116X
DOI:10.1002/macp.1986.021870105
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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6. |
Synthesis of a stereoblock poly(methyl methacrylate) |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 61-69
Martin A. Doherty,
Thieo E. Hogen‐Esch,
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摘要:
AbstractThe sequential block copolymerization of diphenylmethyl methacrylate (DMA) and trityl methacrylate (TrMA), initiated by diphenyl methyl lithium in THF at ‐78°C followed by hydrolysis and methylation with diazomethane, leads to the formation of an isotacticsyndiotactic stereoblock poly(methylmethacrylate) (PMMA) of narrow molecular weight and block length distribution. Complete conversion of DMA is shown to be essential, since the presence of small quantities of this monomer during the polymerization of TrMA significantly lowers the isotactic content of this block. Polymerization times of at least 12 h were found to be necessary for complete polymerization of the Tr
ISSN:0025-116X
DOI:10.1002/macp.1986.021870106
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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7. |
Copolymerization via zwitterion, 5. β‐butyrolactone and 2‐methyl‐2‐oxazoline |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 71-79
Bernabé L. Rivas,
Guido S. Canessa,
Sonia A. Pooley,
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摘要:
AbstractThe zwitterionic copolymerization of 2‐methyl‐2‐oxazoline (MOX) as nucleophilic monomer with β‐butyrolactone (BUL) as electrophilic monomer was investigated in bulk and in solution (CH3CN) at 45°C. The copolymer composition was around 1,5/1,0 (BUL/MOX) as was established by1H NMR.1H and13C NMR spectroscopy were used to identify the copolymers. The IR spectroscopy supported the NMR results. On the other hand, the copolymers behave as polyelectrolytes, according to viscosity determinations. A copolymerization mechanism through a zwitterion species is
ISSN:0025-116X
DOI:10.1002/macp.1986.021870107
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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8. |
Synthesis of fragments of the terminal inverted repeating units of macronuclear DNA from hypotrichous ciliates |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 81-104
Herbert Schott,
Heinz Ruess,
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摘要:
AbstractThe four fragments of the terminal inverted repeating units of macronuclear DNA from hypotrichous ciliates d(A4C4), d(C4A4C4), d(A4C4A4C4) and d(C4A4C4A4C4) were synthesized in preparative amounts (300 mg) by block condensation using the phosphotriester procedure. At first, partially protected nucleosides and mononucleotides were condensed to dimeric blocks using 2,4,6‐triisopropylbenzenesulfonyl chloride andN‐methylimidazole. Longer blocks were synthesized from the dimers using 2,4,6‐triisopropylbenzenesulfonyl chloride and tetrazole. After each condensation the reaction mixture was fractionated using a silica gel column and a step gradient. After synthesis, cleavage of the protecting groups and gelchromatographical separation, d(A4C4) and d(A4C4A4C4) were obtained already as pure substances. On the other hand, having cleaved the protecting groups partially or totally, d(C4A4C4) and d(C4A4C4A4C4) were separated first on QAE‐Sephadex by a salt gradient in 7 M urea. The remaining impurities were removed by preparative reversed phase HPLC. Sequence as well as purity of the DNA fragments were proved by partial enzymatic degradation and two‐dimensional chromatography of the hydrolysates (fin
ISSN:0025-116X
DOI:10.1002/macp.1986.021870108
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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9. |
Synthesis and polymerization ofN‐acryloyl‐ andN‐methacryloylaminomethyl crown ethers |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 105-109
Yohji Nakatsuji,
Shigeo Furuyoshi,
Mitsuo Okahara,
Kiichi Takemoto,
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摘要:
AbstractPolymerizable crown ethers,N‐acryloyl‐ andN‐methacryloyl‐N‐ethylaminomethyl crown ethers (4a,band5a, b), were prepared fromN‐ethylaminomethyl crown ethers (1and2). Their polymerization and copolymerization with styrene afforded the new poly(crown ether)s(6), in which the crown rings are attached to the polymer chain by an am
ISSN:0025-116X
DOI:10.1002/macp.1986.021870109
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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10. |
Functional polymers and sequential copolymers by phase transfer catalysis, 20. Synthesis of copolymers and alternating block copolymers containing thermotropic liquid crystalline polyethers and aromatic poly(ether sulfone) segments |
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Die Makromolekulare Chemie,
Volume 187,
Issue 1,
1986,
Page 111-123
Timothy D. Shaffer,
Virgil Percec,
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摘要:
AbstractCopolymers and alternating block copolymers were prepared both containing a liquid crystalline (LC) polyether segment, based on 4,4′‐biphenyldiol(3)and 1,5‐dibromopentane(2), and a thermoplastic segment, deriving from an aromatic poly(ether sulfone) (PSU)(1). The alternating block copolymer was prepared by the phase transfer catalyzed (PTC) polyetherification of mesogenic α,ω‐bis(5‐bromopentoxy)polyether(5)with α,ω‐bis(hydroxyphenyl)PSU(1). Copolymers containing mesogenic segments were prepared utilizing α,ω‐bis(hydroxyphenyl)‐PSU as another diphenol in the PTC polyetherification of5with2and3. The thermal behavior, as characterized by differential scanning calorimetry (DSC), revealed phase separation for all prepared copolymers as well as liquid crystalline behavior down to a content of mesogenic units deriving from5as low as 30 wt.‐%. Optical polarization microscopy, however, revealed significant differences in textures of the copolymers with the textures observed for homopolymer5. Textures of a5/PSU blend clearl
ISSN:0025-116X
DOI:10.1002/macp.1986.021870110
出版商:Hüthig&Wepf Verlag
年代:1986
数据来源: WILEY
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