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The article presents a highly effective strategy for photopolymerization of acrylates via photolatent redox-accelerated reaction based on the synergistic photoinitiating systems containing photolatent superbase and readily available peroxides. Polymerization of acrylates could be instantly initiated with the effective interaction between the photogenerated amine and peroxides. Due to the persistent...
The iso-concentration ordering kinetics of poly(styrene-b-butadiene) in a neutral solvent, toluene, at several concentrations along the solvent extraction path at room temperature were studied using dynamic mechanical rheological measurements and SAXS. These experiments are in contrast to more common studies of the ordering kinetics of block copolymers in which phase separation following temperature...
This work is theoretically dealt with the kinetics of polycondensation of AB 2 -type monomers in the presence of multifunctional cores (C f ) with various reactivities. The analytical expressions of the molecular size distribution function and the molecular parameters of the resultant hyperbranched polymers were derived. The conversion of A groups (x), feed ratio of the core/monomer...
In this study, the crystallization behavior of polylactide (PLA) was investigated in the presence of dissolved CO 2 using high-pressure and regular differential scanning calorimeter. The isothermal and non-isothermal melt crystallization results showed that increasing the CO 2 pressure decreased the crystallization half-time. During isothermal and low-cooling-rate non-isothermal crystallization,...
In this paper, tetraphenylethylene (TPE) units, one of the typical aggregation-induced emission (AIE) moieties, are utilized to construct a new functional polyfluorene (PF) P1, which exhibited the exciting property of the aggregation-induced emission enhancement (AIEE), instead of the aggregation-caused quenching (ACQ) of normal PFs, and could probe the explosive with high sensitivity both in the...
Simultaneous synchrotron X-ray and stress-strain measurement of un-vulcanized natural rubber (NR) revealed that an upturn of stress at large strains and strain induced crystallization (SIC) are caused by endlinking pseudo network and entanglements. Higher pseudo network density of un-vulcanized NR shows higher modulus and larger fraction of SIC. At faster stretching speed, un-vulcanized NR shows higher...
Cationic polymerization of styrene was conducted with 1-chloro-1-phenylethane (SCl)/AlCl 3 /phenyl methyl ether (PME) initiating system in hexane/CH 2 Cl 2 (60/40, v/v) at −80 °C. The kinetics for cationic polymerization of styrene was investigated by in-situ ATR-FTIR spectroscopy. The isotactic-rich polystyrene (iPS) with m dyad of 81%, mm triad of 63% and mmmm pentad of 50%...
Thermotropic main-chain liquid crystalline polymers typically have very low melt viscosity with strong temperature dependence compared to other common thermoplastics. While this is beneficial in some processing applications, such as injection molding, it presents challenges for others, such as coextrusion. In this study, the rheological properties of a thermotropic main-chain liquid crystalline polymer...
Poly(ether-block-amide) (PEBA), commercially known as PEBAX ® , nanocomposites filled with organically modified clay (Cloisite 30B) and trisilinolphenyl-polyhedral oligomeric silsesquioxane (tsp-POSS) were prepared by a melt mixing method, respectively. The structures of the nanocomposites were investigated using differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR) spectroscopy,...
The bioavailability of hydrophobic drugs is critically dependent on the development of efficient and safe drug delivery vehicles. Nanoparticulate pharmaceutical carriers commonly used in delivery of active components are often non-ionic in nature. Among them polyether based amphiphiles have become increasingly relevant over the past decades. Polyether based amphiphiles exhibit good chemical stability,...
Herein we developed a new approach of creating topologically and well-defined patterned polymeric surfaces via the “grafting to” approach. This was accomplished by either using colloidally templated “clickable” arrays, whereby the chemistry was performed directly onto the pattern or by subsequent backfilling with azido terminated SAM's. Similarly, direct grafting of electroactive temperature responsive...
An additive-assisted one-step melt mixing approach was developed to produce nanocomposites based on linear low density polyethylene (LLDPE) with multiwalled carbon nanotube (MWCNT). The polymer granules, nanotube powder (2 wt% Nanocyl™ NC7000) and 1–10 wt% of the non-ionic additives poly(ethylene glycol) (PEG) or poly(ethylene oxide) (PEO) with molar masses between 100 g/mol and 100,000 g/mol were...
Intergrowth Faujasite and EMC-2 zeolites (FAU/EMT) were grafted with 3-aminopropyltriethoxysilane (APTES), 3-aminopropylmethyldiethoxysilane (APMDES), and 3-aminopropyldimethylethoxysilane (APDMES) containing respectively trihydrolyzable ethoxy groups (3E), di-hydrolyzable ethoxy groups (2E), and monohydrolyzable ethoxy group (1E) in different polarities solvent of isopropanol (IPA), isopropanol/water...
Synthesized and characterized were silica/amylose composite particles with interesting morphologies which we named as silica/amylase composite core–shell particles. Amylose is soluble in hot water. Ethanol addition to a volume fraction f EtOH of 75% caused amylose to aggregate into globules with diameters ∼50 nm and smaller. After ammonia and tetraethoxysilane (TEOS) addition, TEOS underwent...
Microparticles were fabricated for pharmaceutical purposes using electrospraying with the aim to determine the effect of the solvent(s) used. Particles of poly(lactic-co-glycolic acid) (PLGA) and the drug Celecoxib were prepared from acetone, acetonitrile and acetone:methanol with different polymer and drug concentrations. The solvent power, evaporation rate and electrical conductivity of the solvents...
Multiblock copolymers based on alternating segments of telechelic phenoxide terminated hydrophilic fully disulfonated poly(arylene ether sulfone) (BPS100) and decafluorobiphenyl (DFBP) terminated hydrophobic poly(arylene ether ketimine) (PEEKt), were synthesized from the hydrophilic and ketimine-protected amorphous hydrophobic telechelic oligomers by nucleophilic coupling reactions. After film formation...
A new class of ionic copolymers containing amine and phosphonate functionalities has been prepared for the first time. N,N-Diallyl-3-(Diethylphosphonato)-methylammonium chloride underwent cyclocopolymerization with SO 2 to give a cationic polyelectrolyte (CPE) in very good yields. Likewise, ethyl 3-(N,N-diallylammonio)methanephosphonate/SO 2 cyclopolymerization afforded the corresponding...
The aim of this study was to investigate new polyphthalamides (PPA) through the use of molecular modelling techniques and comparison with experimental data. The objectives were to provide a computer simulation method that can be used to predict the properties of polyphthalamides with a good reliability with respect to the experimentally synthesized materials. Several PPA with a variable amount of...
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