Synthesis and Self-Assembly of CO2–Temperature Dual Stimuli-Responsive Triblock Copolymers
摘要:
Poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) with a beta-cyclodextrin (beta-CD) at the chain end was synthesized via atom transfer radical polymerization (ATRP); poly(epsilon-caprolactone) (PCL) with a -C=C- segment and an adamantane (Ada) group at two ends, respectively, was prepared through ring-opening polymerization (ROP), and poly(N-isopropylacrylamide) (PNIPAM) with a -S-C(S)-S- segment, which can be converted into a thiol group, was yielded by reversible addition-fragmentation chain transfer polymerization (RAFT). A supramolecular triblock stimuli-responsive copolymer PNIPAM-b-PCL-b-PDMAEMA having good biocompatibility with PNIPAM and PDMAEMA hydrophilic segments and PCL hydrophobic segment was constructed by thiol-ene Michael addition and host- guest interaction. The triblock copolymer could self-assemble into vesicles and respond to carbon dioxide (CO2) gas and temperature reversibly. Under the stimulation of CO2, the vesicular assemblies swelled obviously; while raising the temperature from 25 to 40 degrees C, the assemblies displayed a conversion between vesicles and spherical micelles.
The present article reports the synthesis and self aggregation study of a novel dendrimer like star polymer based on β-cyclodextrin (β-CD), in which the primary alcoholic arms of β-CD have been linked to ABC type miktoarm star polymers.
Regiochemical Effects on Molecular Stability: A Mechanochemical Evaluation of 1,4- and 1,5-Disubstituted Triazoles
作者:Johnathan N. Brantley、Sai Sriharsha M. Konda、Dmitrii E. Makarov、Christopher W. Bielawski
DOI:10.1021/ja303147a
日期:2012.6.20
grown from 1,4- as well as 1,5-disubstituted 1,2,3-triazoles. Irradiating acetonitrile solutions of these polymers with ultrasound resulted in the formal cycloreversion of the triazoleunits, as determined by a variety of spectroscopic and chemical labeling techniques. The aforementioned reactions were monitored over time, and the rate constant for the cycloreversion of the 1,5-disubstituted triazole
Thermal stability of ester linkage in the presence of 1,2,3-Triazole moiety generated by click reaction
作者:Kyu Seong Lee、So Yeong Park、Hong Chul Moon、Jin Kon Kim
DOI:10.1002/pola.28410
日期:2017.2.1
The copper(I)‐catalyzed alkyne‐azide cycloaddition (CuAAC), so‐called “click” reaction, is one of most useful synthetic strategies to connect two polymer chains. 1,2,3‐Triazole ring (TA) produced by the click reaction has good thermal and chemical stability. However, we observed that block copolymers synthesized by the click reaction showed thermal degradation to give homopolymers when they are thermally
Reaktionsharz-Zusammensetzung und deren Verwendung
申请人:HILTI Aktiengesellschaft
公开号:EP2824155A1
公开(公告)日:2015-01-14
Es wird eine Reaktionsharz-Zusammensetzung mit einem Harzbestandteil, der eine radikalisch polymerisierbare Verbindung enthält, und einem Initiatorsystem, das einen α-Halogencarbonsäureester und ein Katalysatorsystem, welches ein Kupfer(I)salz und wenigstens einen Stickstoff-enthaltenden Liganden umfasst, enthält und deren Verwendung für bauliche Zwecke beschrieben.