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  • 1
    Electronic Resource
    Electronic Resource
    Effect of size and shape in binary nonelectrolyte solutions. I. Measurement of excess free energy and excess volume of benzene-cyclooctane and toluene-cyclooctane (1973)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 18 (1973), S. 147-151 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60057a025
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  • 2
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (INIFERS) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 319-324 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Linear and three-arm star hydroxy-telechelic polyisobutylenes have been quantitatively esterified with pyromellitic dianhydide in the presence of 4-N,N′-dimethylaminopyridine in tetrahydrofuran at room temperature. Chain extension occurred only under reflux conditions (67°C). In the presence of chromium acetyl acetonate catalyst at 140°C insoluble networks were obtained within minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264920
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  • 3
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (inifers) (1983)
    Springer
    Polymer bulletin 9 (1983), S. 27-32 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A variety of primary and tertiary amino-telechelic polyisobutylenes have been synthesized quantitatively by various routes from alcohol-telechelic polyisobutylene. Thus the syntheses of α,ω-di(amino)-, α,ω-di-(N,N′-dimethylamino)-, and α,ω-di(N-phthalimido)polyisobutylenes have been achieved from α,ω-di(hydroxy)polyisobutylene with and without chain enlargement. Three different methods were used: an improved Gabriel synthesis, the reaction of ditosylester of α,ω-di(hydroxy)polyisobutylene with the potassium salt of unsubstituted and disubstituted ethanolamine, and the reduction of α,ω-di(cyanoethanol)polyisobutylene with LiAlH4 at room temperature. Analysis and characterization were done by gel permeation chromatography, IR and 1H-NMR spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275564
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  • 4
    Electronic Resource
    Electronic Resource
    Elucidating the mechanism of carbocationic polymerization of α-methylstyrene (1981)
    Springer
    Polymer bulletin 4 (1981), S. 267-274 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The polymerization of α-methylstyrene (αMeSt) using the “H2O”/SnCl4 initiating system and ethyl chloride solvent has been investigated over the temperature range from −40° to −122°C in the presence and absence of the proton trap 2,6-di-tert-butylpyridine (DtBP). Arrhenius (In ¯Mn versus 1/T) plots obtained with poly (αmethylstyrene) (PαMeSt) samples prepared in the absence of DtBP reveal the existence of two sharply defined temperature regimes (see Figure 1): at higher temperatures from −40 to ∼−86°C, the slope of the Arrhenius plot yields ΔHM n = −4.90±0.25 kcal/mole whereas at lower temperatures, from ∼−86° to −122°C,ΔHM n = −0.3 kcal/mole. With PαMeSt samples prepared in the presence of DtBP the ΔHM n obtained for the higher temperature regime increases to −1.67 ± 0.20 kcal/mole whereas the ΔHM n reflecting the lower temperatures remains the same as that obtained in the absence of DtBP. These observations are readily explained by postulating a change in mechanism at ∼−86°C: Evidently the ¯Mn of PαMeSt is determined over the higher temperature regime by chain transfer to monomer which is frozen out at lower temperatures where termination becomes ¯Mn determinant. In the absence of DtBP chain transfer to monomer is operative which leads to the higher Arrhenius slope over the higher temperature regime; however, over the lower temperature regime where chain transfer is absent and termination is ¯Mn controlling, the Arrhenius slope remains unchanged. Evidence obtained from a Mayo plot (negligible intercept in the 1/¯Mn versus 1/[αMeSt]o plot, Figure 2) with samples prepared at −92°C, corroborate this postulate. Molecular weight dispersities (¯MW/¯Mn) as a function of temperature have been determined in the presence and absence of DtBP (Figure 3). The proton trap affects ¯MW/¯Mn only over the higher temperature regime which also suggests that chain transfer to monomer is frozen out at ∼−86°C and that the polymerization becomes termination dominated at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255102
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  • 5
    Electronic Resource
    Electronic Resource
    Correction (1983)
    Springer
    Polymer bulletin 9 (1983), S. 254-254 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283717
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  • 6
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (inifers) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 25-32 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Linear and three-arm star tosyl-telechelic polyisobutylenes (i.e., PIB's carrying two and three p-toluene-sulfonic acid ester end groups, respectively) have been synthesized and characterized by a variety of techniques. Subsequently these prepolymers were used as macroinitiators for the ring opening polymerization of 2-methyl-2-oxazoline leading to linear poly(N-acetylethyleneimine-b-isobutylene-b-N-acetylethyleneimine) and three-arm star poly(N-acetylethyleneimine-b-isobutylene). High yields (78–98%) and blocking efficiencies (70–80%) have been obtained. The absence of free polyisobutylene in the product indicates highly efficient initiation of 2-methyl-2-oxazoline polymerization by the tosyl-telechelic polyisobutylene. The less than 100% blocking efficiencies are probably due to chain transfer to 2-methyl-2-oxazoline. Hydrolysis of these block copolymers yielded poly(ethyleneimine-b-isobutylenes).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293558
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  • 7
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (Inifers) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 571-578 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Glycidyl ethers of bisphenol- and trisphenol-polyisobutylenes have been prepared, characterized, and cured with amines to new flexible epoxy resins. The synthesis of these glycidyl ethers involved quantitative condensation of epichlorohydrin with phenol-capped linear or three-arm star polyisobutylenes. Proton NMR analysis of the model compound monoglycidyl ether of 2,4,4-trimethyl-2(p-hydroxyphenyl)pentane and the corresponding glycidyl ethers of phenol-capped polyisobutylenes showed the presence of epoxy end groups. According to 1H NMR spectroscopy and titration data the number-average terminal epoxy functionality is close to the theory, i.e., two or three, for the linear and three-arm star products. Curing these new epoxides with triethylene tetramine resulted in transparent, non-tacky flexible films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262937
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  • 8
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (Inifers) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 563-570 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The synthesis and quantitative end group characterization of bisphenol- and trisphenol-polyisobutylenes are described. These new telechelic prepolymers consist of a linear or a threearm star polyisobutylene (PIB) carrying exactly two or three phenol termini, respectively. The syntheses were accomplished by quantitative Friedel-Crafts alkylation of phenol by olefin- and/or tert.-chlorine-telechelic PIB's and characterization involved 1H NMR, UV and GPC techniques. These materials combine the chemical versatility of the- C(CH3)2C6H4OH end group with the attractive physical-chemical properties of the rubbery PIB chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262936
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  • 9
    Electronic Resource
    Electronic Resource
    Poly(β-pinenes) carrying one, two, or three functional end groups. I. The effect of reaction conditions on the polymerization of β-pinenePart XIX of New Telechelic Polymers and Sequential Copolymers by Polyfunctional Initiator-Transfer Agents (Inifers). (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 3219-3227 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: β-Pinene was polymerized with H2O/BCl3 (protic) and p-dicumyl chloride and sym-tricumyl chloride (nonprotic) inifer systems in CH2Cl2 or CH2Cl2/n-C6H14 solvents from -10 to -70°C. The effect of solvent polarity, temperature, and monomer and inifer concentration on conversions and molecular weights was investigated. Low conversions and molecular weights, M̄n = 1300-2500, obtained under these conditions suggest rapid termination.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170201117
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  • 10
    Electronic Resource
    Electronic Resource
    Poly(β-pinenes) carrying one, two, and three functional end groups. II. Syntheses and characterizationPart XX of New Telechelic Polymers and Sequential Copolymers by Polyfunctional Initiator-Transfer Agents (Inifers) (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 3229-3240 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conditions for the convenient synthesis of linear poly(β-pinenes) that carry one or two tert-chloro end groups (∼Clt) and three-arm star poly(β-pinenes) that carry three termini have been worked out. Specifically, the polymer with one ∼Clt end group was prepared by the H2O/BCl3 system, whereas those with two and three ∼Clt termini were prepared by the use of p-dicumyl chloride and sym-tricumyl chloride/BCl3 inifer combinations. The ∼Clt-terminated polymers were dehydro-chlorinated to yield the corresponding olefins. The molecular weights of the products were low enough to permit infrared (IR) and quantitative 1H-NMR investigations. Poly(β-pinene-b-tetrahydrofuran) diblock copolymers have been synthesized by inducing the polymerization of tetrahydrofuran (THF) by the Pβ—Clt/AgCF3SO3 initiating system.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170201118
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