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Novel, facile, and stable mediating agent (dithiobenzoic copper(II)) combining atom transfer radical polymerization (ATRP) and reversible addition fragmentation transfer (RAFT) characteristics was firstly designed by replacing the halogen of ATRP metal catalyst with thiocarbonyl carboxylic group of RAFT agent. As two kinds of mediating agents (ATRP activator and RAFT agent) may be formed in situ during...
Collagen mimetic polypeptides (CMPs) pendanted with linear or dendritic oligoethylene glycols (OEG) via ether linkage were synthesized, and their thermoresponsiveness, secondary structures and supramolecular assembly investigated. High molar masses of OEGylated CMPs were achieved by polyamidation of tripeptide precursors through activated ester strategy. Pendanted linear OEGs confer CMP with enhanced...
Amphiphilic dendritic macromonomers and their corresponding dendronized polymers were synthesized, and their thermoresponsive properties investigated. These dendritic macromolecules are constructed with a second generation lysine-based dendron as the interior (hydrophobic part) and oligoethylene glycol (OEG) linear chains or dendrons (hydrophilic part) covered in their periphery. By changing from...
Using the copper-catalyzed 1,3-dipolar “click” cycloaddition reaction, poly(sulfone)s containing pendant azide moieties were functionalized with various quantities of sodium 3-(prop-2-ynyloxy)propane-1-sulfonate and crosslinked with 1,7-octadiyne. The degrees of sulfonation and crosslinking were systematically varied by changing the ratios of the aforementioned reagents. The polymers were cast into...
We report the synthesis and optoelectronic properties of highly soluble poly(9,10-bis(3′,4′-di(2″-ethylhexyloxy))phenyl)-2,6-anthracenevinylene) (HSM-PAV). The key intermediate for the synthesis of HSM-PAV is 2,6-dimethyl-9,10-dibromoanthracene, and the high solubility of HSM-PAV is from the incorporation of lateral 3,4-di(2-ethylhexyloxy)phenyl moieties into the 9,10-positions of anthracene units...
In this paper, we selected a flexible poly(ethylene oxide) (PEO) connected to a stilbazole head group and a semi-rigid dendron of gallic acid with three alkyl chains to prepare an amphiphilic complex through hydrogen bonding. The structure of flexible-rigid complex has been characterized by 1 H NMR, IR and DLS. From the calculation of the binding interaction, the bonded complex occupies ca...
Double-network hydrogels (DN-gels) are a new class of crosslinked polymer networks with extraordinary mechanical properties while containing 80–90vol.% water. Small-angle neutron scattering (SANS) was applied to investigate the molecular origin of the mechanical properties observed in DN-gels. We present SANS results in both deformed and undeformed conditions for a tough DN-gel made of poly(2-acrylamido-2-methyl-1-propane...
The kinetics of the deprotection reaction in model photoresist materials was measured as a function of copolymer composition with Fourier transform infrared (FTIR) spectroscopy. A mathematical model was developed to analyze the deprotection kinetics in terms of the coupled reaction rate and acid-diffusion processes. The first-order reaction rate constant decreases as the non-reactive comonomer content...
Moisture absorption into ultrathin poly(vinyl pyrrolidone) (PVP) films with varying thickness was examined using X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements. Two different surfaces were used for the substrate: a hydrophilic silicon oxide (SiO x ) and a hydrophobic hexamethyldisilazane (HMDS) treated silicon oxide surface. The total equilibrium moisture absorption...
With the development of new manufacturing processes, such as low-pressure compression moulding of sheet moulding compound (SMC), resin transfer moulding (RTM) and vacuum infusion liquid composite moulding (e.g. SCRIMP) processes, low-shrinkage moulding compounds which can be processed at low temperatures have attracted considerable interest from the composite industry. In this paper, an integrated...
The diffusion of linear polystyrene (PS) into its crosslinked counterpart was studied using both neutron reflectivity (NR) and forward recoil scattering (FRES). The penetrant molecular weights were monodisperse and ranged from 10 000 to 690 000 g mol -1 . The molecular weight between crosslinks was kept at 22 000 g mol -1 . The crosslinks were introduced by polymerizing...
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