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@PHDTHESIS{He:62855,
      author       = {He, YingChun},
      othercontributors = {Möller, Martin},
      title        = {{F}rom cyclic carbonate bifunctional couplers to
                      amphiphilic poly(ethylene imine)s},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-124352},
      pages        = {VIII, 274 S. : graph. Darst.},
      year         = {2012},
      note         = {Aachen, Techn. Hochsch., Diss., 2012},
      abstract     = {This dissertation is concerned with two subjects:
                      bifunctional couplers and multifunctional poly(ethylene
                      imine)s (Figure 1). Bifunctional couplers discussed in this
                      thesis are mostly bearing at least one five-membered ring
                      carbonate. These bifunctional couplers were suitable for the
                      selective combination of two functional primary amines. Via
                      addition or substitution reactions of bifunctional couplers
                      with functional amines, functional couplers with different
                      properties bearing a five-membered ring carbonate were
                      obtained. These functional couplers were used to prepare
                      tailor made multifunctional poly(ethylene imine)s by
                      ring-opening reaction of functional five-membered ring
                      carbonates with poly(ethylene imine)s. Based on the
                      chemistry of cyclic carbonates, phenyl carbonate,
                      chloroformates, and epoxides, in total 10 bifunctional
                      couplers (A1-A5, B1-B3, C1-C2, and BC56) with different
                      coupling concepts – substitution/addition or
                      addition/addition – were synthesized (Figure 2). Their
                      reactivity and selectivity towards amines were studied. The
                      hydrolytic stability of BC56 and functional couplers
                      synthesized from BC56 were tested. In the ring opening
                      reaction of cyclic carbonates with amines, urethane groups
                      with an adjacent hydroxyl group were formed. The
                      modification of these hydroxyl groups were studied in
                      chapter 4. The application of bifunctional coupler BC56 for
                      the synthesis of hydroxyl functional polyurethanes was
                      discussed in chapter 3. Functional cyclic carbonates
                      prepared from A1 – A4 were used for the modification of
                      poly(ethylene imine)s. Multifunctional poly(ethylene imine)s
                      bearing functional groups such as hydrophobic chains of
                      various lengths, hydrophilic groups, cationic (ammonium)
                      groups, amphiphilic groups, and/or labeling groups (pyrene)
                      were synthesized und characterized. Multifunctional
                      poly(ethylene imine)s can be obtained in one-step synthesis
                      or in sequential addition synthesis by reaction with
                      different kind of functional cyclic carbonates. The
                      influence of the preparation process on their microstructure
                      and antimicrobial properties was studied in chapter 6. In
                      the antimicrobial process, cationic and hydrophobic
                      functional groups interact both with the bacterial membrane.
                      The way of cationic and hydrophobic groups linked to each
                      other and linked on the poly(ethylene imine) molecules
                      influenced the antimicrobial efficiency of the
                      cationic/hydrophobic modified small compounds and
                      poly(ethylene imine)s (chapter 7). In order to study the
                      absorption of multifunctional poly(ethylene imine)s on
                      negatively charged surfaces, single molecules of
                      multifunctional poly(ethylene imine)s were visualized on
                      mica substrates via atomic force microscopy (AFM) (in
                      chapter 5). The properties of multifunctional poly(ethylene
                      imine)s in thin layers and in water solution and their
                      hydrolytic and thermal stability were investigated in
                      chapter 8.},
      keywords     = {Bifunktionelle Verbindungen (SWD) / Fünfringverbindungen
                      (SWD) / Cyclische Verbindungen (SWD) / Carbonate (SWD)},
      cin          = {154720 / 150000},
      ddc          = {540},
      cid          = {$I:(DE-82)154720_20140620$ / $I:(DE-82)150000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-opus-40669},
      url          = {https://publications.rwth-aachen.de/record/62855},
}