Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

Partnerzy

P. von Tiedemann

Johannes Gutenberg University (DE)

Ostatnie publikacje
1.  von Tiedemann P., Maciol K., Preis J., Sajkiewicz P., Frey H., Rapid one-pot synthesis of tapered star copolymers via ultra-fast coupling of polystyryllithium chain ends, Polymer Chemistry, ISSN: 1759-9954, DOI: 10.1039/C8PY01656A, Vol.10, No.14, pp.1762-1768, 2019

Streszczenie:
Highly efficient stoichiometric coupling of sterically hindered polystyryllithium (PS-Li) chain ends was achieved using tetra[3-(chloro-dimethylsilyl)propyl]silane (TCDMSPS) as the linking agent. Based on the disparate reactivities of isoprene (I, rI = 11.0) and styrene (S, rS = 0.049) in the anionic copolymerization in nonpolar media, poly(isoprene0.5-grad-styrene0.5) (P(I0.5-grad-S0.5)) tapered 4-arm star copolymers were synthesized in only two steps. The tapered 4-arm star copolymers (Mwtargeted = 40 to 160 kg mol^-1) were synthesized with high star functionalities f (Mw,star/Mw,arm = 3.68 - 3.98), low dispersity (Ð = 1.06 - 1.15) and minimal residual precursor content (2-8 wt%), avoiding fractionation or other purification methods. Coupling kinetics measurements revealed that for the synthesis of polystyrene (PS) 4-arm stars (12 kg mol^-1) a coupling efficiency of 98% was already achieved within 2 minutes. All star polymers were analyzed by size exclusion chromatography (SEC) viscometry with universal calibration (UC) as well as NMR spectroscopy. Well-defined nanofibers from the tapered copolymer stars were obtained via electrospinning.

Afiliacje autorów:
von Tiedemann P. - Johannes Gutenberg University (DE)
Maciol K. - Johannes Gutenberg University (DE)
Preis J. - PSS Polymer Standards Service GmbH (DE)
Sajkiewicz P. - IPPT PAN
Frey H. - Johannes Gutenberg University (DE)
140p.

Kategoria A Plus

IPPT PAN

logo ippt            ul. Pawińskiego 5B, 02-106 Warszawa
  +48 22 826 12 81 (centrala)
  +48 22 826 98 15
 

Znajdź nas

mapka
© Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk 2021