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  • 1
    Electronic Resource
    Electronic Resource
    Structural analysis by carbon-13 NMR of copolyethers of 2-methyloxacyclobutane and 2-methyloxacyclopentane (1983)
    s.l. : American Chemical Society
    Macromolecules 16 (1983), S. 1544-1546 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00243a024
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  • 2
    Electronic Resource
    Electronic Resource
    Syntheses of 1,4-Anhydro-2,3,6-tri-O-methyl-D-galactose and 1,4-Anhydro-2,3-di-O-methyl-L-arabinose (1965)
    s.l. : American Chemical Society
    The @journal of organic chemistry 30 (1965), S. 3951-3953 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01022a516
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid crystal polyethers obtained from endo- and exo-2-methyl-7-oxabicyclo[2.2.1]heptane (1986)
    Springer
    Polymer bulletin 16 (1986), S. 507-511 
    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 Polyethers prepared by ring-opening polymerization of endoand exo-2-methyl-7-oxa[2.2.1]heptane have been found to exhibit thermotropic liquid crystal properties. The lower melting characteristics of the polyether prepared from the exo isomer are related to an irregular polymer structure compared to a very uniform structure of the polyether prepared from the endo isomer. In spite of the irregularities, liquid crystals form easily since apparently the various structural units are accommodated in the mesophases. The structural differences arise from the difference in steric hindrance from the methyl substituent of the two isomeric monomer in the chain propagation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255220
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of poly(styrene-b-isobutylene-b-styrene) triblock copolymer by ATRP (1998)
    Springer
    Polymer bulletin 41 (1998), S. 639-644 
    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 poly(styrene-b-isobutylene-b-styrene) triblock copolymer has been prepared by a two-step process. Polyisobutylene with Mn= 6600 and Mw/Mn= 1.12 functionalized with phenol at both ends was reacted with 2-bromopropionyl chloride to form a macroinitioator for atom transfer radical polymerization (ATRP). The synthesized difunctional PIB macroinitiator was subsequently heated with styrene xylene solution in the second step to 110°C under conditions for ATRP using the copper coordination complex CuBr/bipyridine. Both the macroinitiator and the triblock copolymer were characterized by 1H NMR and SEC. The triblock copolymer with around 25% polystyrene was found to have a narrow molecular weight distribution of 1.20.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050412
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  • 5
    Electronic Resource
    Electronic Resource
    Controlled/“living” atom transfer radical polymerization of styrene in the synthesis of amphiphilic diblock copolymers from a poly(ethylene glycol) macroinitiator (1999)
    Springer
    Polymer bulletin 42 (1999), S. 153-158 
    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 Atom transfer radical polymerization (ATRP) of styrene was initiated by a poly(ethylene glycol) macroinitiator prepared by quantitative esterification of MPEG2000 with 2-chloropropionyl chloride. The polymerization carried out at 130°C catalyzed by addition of cuprous chloride and 2,2'-bipyridine has been found to comply to the criteria for a “living” polymerization, since a linear versus monomer conversion plot was found in accordance with the theoretical line indicating essentially 100% initiating efficiency. Also the polymerization is first order with respect to monomer concentration determined in two independent ways. The polydispersity index remained around 1.3 throughout the polymerization and no formation of homopolystyrene could be detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050447
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  • 6
    Electronic Resource
    Electronic Resource
    Living carbocationic polymerization of isobutylene and synthesis of ABA block copolymers by conventional laboratory techniques (1993)
    Springer
    Polymer bulletin 31 (1993), S. 159-166 
    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 Living polymerization of isobutylene (IB) and subsequent controlled synthesis of ABA block copolymers, such as poly(styrene-b-isobutylene-b-styrene) (PSt-PIB-PSt) and poly(p-methylstyrene-b-isobutylene-b-p-methylstyrene) (PpMeSt-PIB-PpMeSt), have been carried out by a simple and inexpensive conventional laboratory technique. The homo- and block copolymers obtained by using this technique have exhibited excellent molecular weight control and low polydispersity indexes. The living nature of IB polymerization has been demonstrated by the incremental monomer addition (IMA) method with the dicumyl methyl ether (DiCumOMe)/TiCl4 initiating system in the presence of 2,5-di-tert-butylpyridine (DtBP) proton trap. PSt-PIB-PSt and PpMeSt-PIB-PpMeSt block copolymers have been synthesized by sequential monomer addition: first living difunctional polyisobutylene (PIB) midsegment was prepared by difunctional initiator, then the second monomer was added to the charge. High blocking efficiencies and desired block copolymer structures have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329961
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  • 7
    Electronic Resource
    Electronic Resource
    Slow initiation by tert-butoxybenzenes in living cationic polymerization of isobutylene (1995)
    Springer
    Polymer bulletin 35 (1995), S. 583-590 
    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 tert-Butoxybenzenes including the 4-substituted derivatives of anisole, toluene and p-chlorobenzene have been synthesized and studied as initiators in combination with TiCl4 for polymerization of isobutylene (IB) in CH2Cl2/methylcyclohexane (MeCHx) solvent mixtures at -78°C. Living polymerizations with slow initiation were observed by the allmonomer-in (AMI) and incremental monomer addition (IMA) techniques, and polymers with narrow molecular weight distribution (MWD) (Mw/Mn〉1.1) were obtained under certain conditions. Aging of the initiating system prior to charging the monomer does not improve the initiating efficiency. It has been found that the initiating efficiency can be increased by increasing the solvent polarity, however, the relative volume of CH2Cl2 is limited in order to avoid polymer precipitation and bimodal MWD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324112
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of tri-block copolymer based on polyisobutylene and poly(ethylene glycol) (1995)
    Springer
    Polymer bulletin 34 (1995), S. 279-286 
    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 block copolymer having polyisobutylene (PIB) as hydrophobic segment and poly(ethylene glycol) (PEG) as hydrophilic segments has been synthesized by a two-step process. Polyisobutylene was functionalized with phenol at both ends using BF3· OEt2 as catalyst, and then coupled with tosylated monomethoxy PEG. The reaction conditions were established by model studies. The characterization of the reaction product by NMR and PGC verified the formation of block copolymer by the coupling reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294145
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of triblock and random copolymers of 4-acetoxystyrene and styrene by living atom transfer radical polymerization (1997)
    Springer
    Polymer bulletin 39 (1997), S. 559-565 
    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: Abstract. Triblock copolymers containing polystyrene (PSt) and poly(4-acetoxystyrene) (PAcOSt) segments have been prepared by atom transfer radical polymerization (ATRP). In the first step one of the two monomers was polymerized in bulk using the initiating system α,α′-dibromo-p-xylene/CuBr/2,2′-bipyridine (1/1/3). Subsequently the resulting telechelic polymers with active bromo end group structures were used as macroinitiators for the polymerization of the second monomer under ATRP conditions. This process gave PAcOSt-PSt-PAcOSt and PSt-PAcOSt-PSt triblock copolymers with predetermined molecular weights and narrow molecular weight distributions. Polymerization of a mixture of equal molar amounts of the two monomers yielded a random copolymer with narrow molecular weight distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050186
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation by suspension polymerization of porous beads for enzyme immobilization (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 169-177 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Porous beads have been prepared by suspension polymerization of acrylic monomers and divinyl benzene in the presence of a porogen. The porosity varies greatly with the polymer composition, with the amount and type of porogen and with the conditions for the preparation. The enzyme binding capacity and activity has been determined for a lipase. The best results are found for crosslinked poly(methyl methacrylate) beads while other polyacrylates are less effective. Compositions based on poly(methacrylic acid) are not suitable for enzyme binding.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390114
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