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  • 1
    Electronic Resource
    Electronic Resource
    Anionic graft copolymerization of methyl methacrylate with lithium diisopropylamide-treated poly(methyl α-substituted acrylate)s (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 101-107 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The anionic grafting of methyl methacrylate onto several lithium diisopropylamide (LDA)  -  treated polymers of methyl α-substituted acrylates containing an active methylene or methine group was investigated. The grafting was carried out using a mole ratio of LDA/acrylate unit of 0.75 in the feed polymer. The anionic graft copolymerizability of these acrylate polymers largely depends upon the surrounding of the active α-hydrogen atom adjoining a carbonyl group or of the carbanion produced by the LDA treatment in the feed polymer.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1996.030170205
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  • 2
    Electronic Resource
    Electronic Resource
    Graft copolymerization of methyl methacrylate by lithium diisopropylamide-treated poly(vinyl propionate) (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 2799-2804 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The anionic grafting of methyl methacrylate (MMA) onto poly(vinyl propionate) (PVPr) was achieved after treatment of the latter with lithium diisopropylamide (LDA). The percentage of grafting of the polymer was between 120 and 730%, no homopolymers being obtained. The degree of lithiation was determined to be 26 mol-% with respect to monomer units by means of deuterolysis. The hydrolysis of the graft copolymers results in the side-chain polymers (PMMA) and poly(vinyl alcohol) (PVA). The average number of branches in the graft copolymer increases from 1 to 7 with increasing percentage of grafting. M̄w/M̄n of the side chain poymer is between 2,0 and 6,7. The low reactivity of the lithium sites may be caused by aggregation of enolates, leading of the broadening of the molecular weight distribution.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950811
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal polymerizations of alkali and alkaline earth 4-vinylbenzoates in bulk (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 619-623 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermal polymerizations of alkali and alkaline earth 4-vinylbenzoates (4-VBAs) in bulk were investigated. The relative reactivity of the alkali salts decreases in the following order: K 〉 Na 〉 Li, which is in reverse order to that of alkali methacrylates. In the polymerization of K-4-VBA at 240°C, the number-average molecular weight decreases with increasing reaction time, although the yield of polymer increases. The polymerization of the K salt proceeds as long as the crystallinity of the monomeric salt is maintained, and is terminated when there is no crystalline compound in the reaction mixture left. The relative reactivity of the alkaline earth salts decreases in the following order: Mg 〉 Ca 〉 Sr ≫ Ba. The polymerization of Mg-4-VBA proceeds rapidly at 240°C in the initial stage (30 min) and then levels off, however, the appearance of the reaction mixture still remains crystalline.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal polymerizations of alkali 4-(1-bromoethyl)benzoates (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 805-811 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermal reactions of alkali salts of 4-(1-bromoethyl)benzoic acid in bulk were investigated. These reactions were found to produce unexpectedly the graft copolymer, poly(4-vinylbenzoate)-graft-oligo(oxycarbonyl-1,4-phenylenethylidene) (1). The relative reactivity of the oligocondensation as well as the vinyl polymerization of the salts decreased in the following order: K 〉 Na 〉 Li. The reaction polymerization rate proceeded rapidly during the initial 15 min, and then slowed down.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1996.030171108
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and properties of aromatic polyimides derived from 2,7-triptycenediamine (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 2239-2245 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Novel aromatic polyimides were synthesized from 9,10-dihydro-9,10-o-benzenoanthracene-1,5-diamine (2,7-triptycenediamine) and aromatic tetracarboxylic dianhydrides. The polymerization was carried out in a two-step procedure including ring-opening poly-addition giving polyamic acids, followed by thermal cyclodehydration. The polyamic acids have high inherent viscosities (0.97-1.95 dL/g in 1-methyl-2-pyrrolidone). The polyimides show high glass transition temperatures (392-409°C), high decomposition temperatures at 5% weight loss (516-566°C), and high weight residues (64-69% at 800°C). All polyimides are amorphous. The polyimide from the diamine with 3,3′,4,4′-diphenylsulfonetetracarboxylic dianhydride (4,4′-sulfonyldiphthalic anhydride) is soluble in pyridine, N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide and conc. sulfuric acid at 60°C, and shows high thermal stability. The introduction of 2,7-triptycenediyl structure into the polyimide backbone has the effect of improving the solubility and maintaining the high thermal stability.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021970715
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and properties of poly(arylene ether sulfone)s and poly(arylene ether ketones) derived from 4,4″-dihydroxy-o-terphenyl (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 16 (1995), S. 495-501 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Novel poly(arylene ether)s with a rigid and zigzag 4,4″-o-terphenyldiyl structure, introduced into the polymer backbone were synthesized by nucleophilic displacement reaction of 4,4″-dihydroxy-o-terphenyl with several activated aromatic dihalides in virtually quantitative yields. The poly(arylene ether)s having high molecular weight show both good solubility in common organic solvents and high thermal stability up to 545°C. They are amorphous with glass transition temperatures of 160-200°C.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1995.030160707
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  • 7
    Electronic Resource
    Electronic Resource
    Anionic graft copolymerization of methyl methacrylate with lithium diisopropylamide-treated poly(methacrylate)s (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 3675-3687 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The anionic grafting of methyl methacrylate onto several lithium diisopropylamide (LDA)-treated polymers of methacrylates, such as 2-acetoxyethyl methacrylate (1), 2-propionyloxyethyl methacrylate (2), 2-isobutyryloxyethyl methacrylate (3), 1-methoxy-carbonylethyl methacrylate (4), and methoxycarbonylmethyl methacrylate (5), or onto the LDA-treated copolymers of the methacrylates with styrene was investigated. Graftings onto homopolymethacrylates and onto the copolymers of 1 and 2 with styrene did not occur due to the deactivation of the macromolecular lithium enolate by side reactions. Graftings onto copolymers P-3, P-4 and P-5, from methacrylates 3, 4 and 5 with styrene, however, proceeded. The relative grafting efficiency decreases in the following order: P-3 〉 P-4 〉 P-5. The grafting is highly influenced by the aggregation behavior of the macromolecular lithium enolates and the side reactions deactivating the lithium enolate. The aggregation behavior decreases the number of the activated points on the feed polymer, lowers the inititiation rate and the polymerization rate of the grafting, and causes a large polydispersity value (M̄w/M̄n) of the side-chain poly(MMA).
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021971115
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