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  • 1
    Digitale Medien
    Digitale Medien
    Synthesis of poly(dibenzo-19-crown-6) via cyclopolymerization of diepoxide (1991)
    Springer
    Polymer bulletin 25 (1991), S. 153-159 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Synthesis and cyclopolymerization of 5,6;14,15-dibenzo- 1, 2; 18, 19-diepoxy- 4, 7, 10, 13, 16-pentaoxanonadeca- 5,14-diene (3) was carried out. The polymerization of 3 with tin tetrachloride and boron trifluoride etherate gave the polymers with lower molecular weight. Alternatively, triethylaluminium-water-acetylacetone (Vandenberg catalyst) was effective in preparing polymers of high molecular weight which were soluble in p-cresol and p-chlorophenol. The polymers were essentially composed of cyclic constitutional units corresponding to dibenzo-19-crown-6. The cation-binding ability of the polymer showed the highest selectivity for K+.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310786
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  • 2
    Digitale Medien
    Digitale Medien
    UV absorption spectra of polystyrene (1991)
    Springer
    Polymer bulletin 25 (1991), S. 211-216 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Polystyrene (PSt) exhibits a new UV absorption band at around 290nm in comparison with ethylbenzene, which is attributed to associative interaction between pendant phenyl groups. Similar absorption bands are also observed for polymers of styrene derivatives. The UV spectra suggest charge-transfer complex formation between the polymeric and monomeric donors with electron-acceptor tetracyanoethylene (TCNE) and the equilibrium constants were estimated to be in the sequence of ethylbenzene 〉 PSt 〉 copolymer of St with methylmethacrylate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310794
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  • 3
    Digitale Medien
    Digitale Medien
    Phase transfer catalyzed polymerization of 4-bromo-2,6-dimethylphenol in the presence of a terminating comonomer phenol: 2,4,6-tri-tert-butylphenol or 4-bromo-2,6-di-tert-butylphenol (1991)
    Springer
    Polymer bulletin 25 (1991), S. 33-40 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary This paper describes the phase transfer catalyzed (PTC) polymerization of 4-bromo-2,6-dimethylphenol (1) in the presence 2,4,6-tri-tert-butylphenol (2) or 4-bromo-2,6-di-tert-butylphenol (4). The polymerization of 1 in the presence of 2 at a 1/2 molar ratio of 3/1 led to poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with $$\overline {\text{M}}$$ n of 13400 g/mol at a yield of 85%. In contrast, the polymerization of 1 in the presence of 4 at 1/4 molar ratios of 5/1 and 10/1 did not produce any methanol insoluble PPO fraction when 4 was added at the beginning of the polymerization. However, PPO with $$\overline {\text{M}}$$ n + 1600 to 2400 g/mol were obtained when 4 was added to the polymerization system after 0.5 h and respectively 2.0 h after the homopolymerization of 1 was started. A radical-anion mechanism is proposed to account for these polymerization results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00338896
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  • 4
    Digitale Medien
    Digitale Medien
    Smectic liquid crystalline polyoxetane with novel mesogenic group (1991)
    Springer
    Polymer bulletin 25 (1991), S. 439-442 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Polyoxetane was found to be a good main chain for well-developed smectic liquid crystalline state, when cyano substituted biphenyls were used as mesogenic groups attached through four methylene spacer. With this main chain and spacer, fluorine substituted biphenyl was found to be a novel and good mesogenic group for liquid crystalline state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310234
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  • 5
    Digitale Medien
    Digitale Medien
    Water-soluble and amphiphilic polymers (1991)
    Springer
    Polymer bulletin 25 (1991), S. 467-474 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary A novel comb-like amphiphilic polymer, poly (2-acrylanidohexadecylsulfonic acid) (PAMC18S), was synthesized by free radical polymerization of the corresponding anphiphilic nonomer in 1,4-dioxane-water mixed solvents. Depending on the ratio of water/dioxane in the solvent, the reaction proceeded by either precipitation polynerization or nicellar polymerization. The nolecular weight of the polymer obtained under similar conditions decreased and subsequently increased with the increase of water content in the mixed solvent. The polyion nature of PAMC16S was confirmed by viscosity data of ethanolic solutions. In addition, the polymer was characterized by solubility, IR, TG and wide angle X-ray diffraction methods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310238
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  • 6
    Digitale Medien
    Digitale Medien
    Monitoring the WCl6/(CH3)4Sn initiated polymerization of substituted acetylenes by 1H-NMR spectroscopy (1991)
    Springer
    Polymer bulletin 25 (1991), S. 483-490 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary A study of the WCl6/(CH3)4Sn/CD2Cl2 initiated polymerization of otrimethylsilylphenylacetylene and 2-hexyne was completed. This study suggests that generated carbenes initiate the polymerization of mono and disubstituted acetylenes. Evidence was provided which clearly shows the formation ofthe initiating [W]=CH2 carbene complex and its immediate disappearance upon addition of both the 2-hexyne and o-trimethylsilylphenylacetylene. Under the reaction conditions used in the present study, no spectroscopic evidence of an initiating or propagating chain end or metallocyclobutene intermediate could be provided.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310240
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  • 7
    Digitale Medien
    Digitale Medien
    Indexed in current contents (1991)
    Springer
    Polymer bulletin 25 (1991), S. A3 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310245
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  • 8
    Digitale Medien
    Digitale Medien
    Copolymers from [1.1.1]propellanes and acceptor-substituted olefins (1991)
    Springer
    Polymer bulletin 25 (1991), S. 293-297 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary A variety of substituted olefins which undergo clean copolymerization with [1.1.1]propellanes 1a,b is presented in this article. For olefins substituted by acceptor groups, strictly alternating 1:1 copolymers are obtained whose structures are proven using high resolution NMR spectroscopy. Evidence for a radical chain mechanism of these copolymerizations is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00316897
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  • 9
    Digitale Medien
    Digitale Medien
    Polymerization temperature effects on the properties of l-lactide and ε-caprolactone copolymers (1991)
    Springer
    Polymer bulletin 25 (1991), S. 335-341 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The large difference in reactivity of L-lactide and ε-caprolactone in ring opening polymerization with stannous octoate, leads to the formation of copolymers with blocky structures. By varying the polymerization temperature, copolymers with different average sequence lengths and molecular weights can be synthesized. It is shown that the average monomer sequence length has a large effect on the thermal and mechanical properties of these copolymers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00316903
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  • 10
    Digitale Medien
    Digitale Medien
    Water-soluble and amphiphilic polymers (1991)
    Springer
    Polymer bulletin 25 (1991), S. 459-466 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Thin filns of PSt/PMAA and PEO-PSt-PEO block polyners were deposited on a polystyrene substrate by solution adsorption (with or without solvent treatnent), and the filn surfaces were characterized by neans of XPS. Direct solvent-casting of PEO-PSt-PEO from benzene solutions resulted in PSt-rich surfaces, whereas PMAA richer surfaces were obtained for PSt/PMAA filns cast from DMF solutions. Moreover, solvent treatment after casting had profound effect on the filn surface conposition. Treatment with water markedly increased the surface concentration of polar PEO segments. In the case of PSt-PMAA block polymers, the PSt content on the surface increased in the order of water〈 ethanol 〈 cyclohexane 〈 petroleum ether, the last-named giving films with almost pure PSt surface. It is well worth noticing that the bulk conposition had little to do with the surface conposition for both PSt/PMAA and PEO-PSt-PEO block polyners within the conposition range investigated when subsequent solvent treatnent was applied.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310237
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