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The combination of asymmetric P4VP-b-PAPI diblock copolymers (i.e. fP4VP≠fPAPI) and 3-NDP surfactants in hydrogen-bonded [poly(4-vinylpyridine)-block-poly(N-acryloylpiperidine)](3-nonadecylphenol)x (P4PA(3-NDP)x) supramolecular double-comb diblock copolymers could potentially result in rather interesting morphologies. However, plasticization of the copolymer and the ability of 3-NDP to crystallize...
We propose a strategy to adjust the size of multiliposomal complexes made of small unilamellar anionic liposomes (lipid bilayer vesicles prepared from zwitterionic lipid 1,2-dioleoyl-sn-glycero-3-phosphocholine DOPC and ionic lipid 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-l-serine POPS with a typical diameter of 50 nm) with cationic polymers due to electrostatic attraction. Hereby, the use of quaternized...
Functionalized polymer filter (FPF) was fabricated using a synthesized terpolymer containing a quaternary ammonium moiety via electrospinning method to enhance the durability of air filters. Removal efficiency and durability of FPF were exhibited compared with those of polystyrene (PS) filter and a commercial electret filter. FPF showed the best performance than others, and the removal efficiencies...
A hydroxyl-functionalized triptycene-based polyimide of intrinsic microporosity (TDA1-APAF) was converted to a polybenzoxazole (PBO) by heat treatment at 460 °C under nitrogen atmosphere. TDA1-APAF treated for 15 min (TR 460) resulted in a PBO conversion of 95% based on a theoretical weight loss of 11.7 wt% of the polyimide precursor. The BET surface area of the TR 460 (680 m2 g−1) was significantly...
A soluble polysilsesquioxane (PSQ) containing phosphonic acid side-chain groups (PSQ-PO3H2) was successfully prepared by hydrolytic polycondensation of 2-(diethoxyphosphoryl)ethyltriethoxysilane using concentrated hydrochloric acid as a catalyst. The 29Si NMR spectrum of PSQ-PO3H2 indicated two broad T3 and T2 signals with an integrated ratio of ca. 0.88:0.12. The weight-average molecular weight of...
Aliphatic polyesters have been widely used in environmental and biomedical engineering, but a lack of functional groups limits their applications. Here, we reported a facile approach to synthesize vinyl functional polyester via the ring opening copolymerization of ε-caprolactone (CL) and allyl glycidyl ether (AGE). NMR analysis confirmed the copolymeric structures and suggested that the copolymerization...
Blend membranes based on the Pebax 1657 and polyvinyl acetate (PVAc) or VAc/dibutyl maleate copolymer (P(VAc-co-DBM)) were prepared via solution casting. SEM micrographs did not show any phase separation in the macro-scale. FT-IR results showed that hydrogen bonding of NH groups with carbonyl groups in the polyamide (PA) microphases or ether groups in the poly(ethylene oxide) (PEO) microphases changes...
Cobalt based driers are the most commonly used primary catalysts in alkyd coatings as they promote fast drying and lead to hard coatings. However, several studies have suggested potential reclassification of cobalt-based alkyd driers. Therefore, cobalt based driers are being replaced by alternatives, e.g. based on iron or manganese. In practice primary driers (Co, Mn, or Fe) are used in combination...
Broader applications of polymer hydrogels are largely constrained by their poor mechanical performance. Here, we report our strategy of achieving ultrahigh mechanical strength, toughness, and self-healing properties simultaneously in a hybrid dual crosslinked polyacrylic acid (PAAc) hydrogel. The hybrid PAAc hydrogel was fabricated in a one-pot reaction with two types of crosslinking points, i.e....
The liquid-liquid equilibrium (LLE) calculation for polymer solutions is essential for processes design of polymerization. The hydrogen bonding in polymer solutions leads to deviate remarkably from normal solutions behaviors. The perturbed hard-sphere-chain-association (PHSC-AS) equation of state (EoS) is applied to calculate the liquid-liquid equilibrium (LLE) of polymer mixtures with hydrogen bonding...
The gas transport properties of polymer nanocomposite membranes made of Few Layer Graphene nanoplatelets dispersed in amine-modified epoxy resins were studied by gas phase permeation analysis with H2, N2 and CO2. The gas permeability of the nanocomposites decreases with increasing filler content. Filler addition does not change the gas selectivity of the pure epoxy membrane. Positron Annihilation...
Using salt-doped polystyrene-b-poly(2-vinylpyridine) star shaped block copolymer as a model, we show that the architecture of (A-b-B)n type multi-arm star block copolymers enhances the ordering of the block copolymers, enabling the generation of nanostructures with microdomain periods less than 10 nm. The influence of the arm number on the order-to-disorder transition temperature and molecular weight...
A novel hyperbranched polyether epoxy (HBPEE) bearing a stiff fluorene unit and flexible aliphatic chains has been synthesized using a one-pot approach and used as a toughener for bis-benzoxazine resin (MDA-BOZ). Effects of loadings and molecular weight of HBPEE on curing behavior, rheology properties, static mechanical, dynamic mechanical and thermal properties of the hybrid systems have been studied...
Two donor-π-acceptor (D-π-A) type low bandgap (LBG) conjugated polymers, namely, PT-DTNT-DT and PTT-DTNT-DT, consisting of thiophene (T) and/or thieno[3,2-b]thiophene (TT) as donor moiety, two flanking 2-decyltetradecylthienyl as π-bridges and large planarity and strong electron-withdrawing naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT) as acceptor moiety have been developed and systematically investigated...
An ex-situ approach was applied to prepare nanocomposites from hyperbranched poly(amidoamine) and modified kaolinite (Ka-DCA). The structure of the polymer and the corresponding nanocomposites was investigated by FTIR, DSC, SAXS and TEM. SAXS might suggest a partly exfoliated structure of the nanocomposites, which was supported by TEM. The molecular dynamics was studied by means of broadband dielectric...
Novel fast-responding shape-memory polyurethanes were prepared from bio-based polyols, diphenyl methane diisocyanate and butane diol for the first time. The bio-based polyester polyols were synthesized from 9-hydroxynonanoic acid, a product obtained by ozonolysis of fatty acids extracted from soy oil and castor oil. The morphology of polyurethanes was investigated by synchrotron ultra-small angle...
Nanoparticle reinforcement at low and moderately high loadings has been assigned to the hydrodynamic and networking effects, respectively while the conclusions are ambiguous without specifying the “frequency”-dependent polymer dynamics. Herein a unique time-concentration superpositioning (TCS) principle is disclosed for accounting for the hydrodynamic-to-jamming regime transition associated with the...
We study the stability of twin boundaries and slip in crystalline orthorhombic polyethylene by means of density functional theory (DFT), using a nonempirical, truly nonlocal density function, and by means of classical molecular dynamics (MD). The results show that, in accordance with experimental observations, there is a clear preference to chain slip over transverse slip for all considered slip planes...
Non-spherical (ns) hollow latex (HL) particle with a void on one side of a polymer particle surrounded by a double-layered shell was fabricated via the one-pot seeded emulsion polymerization (SEP). Start from the ns seed formed by swelling styrene (St) or methyl methacrylate (MMA) mixed with azobisisobutyronitrile into a crosslinked spherical poly(styrene/divinyl benzene/acrylic acid) P(St/DVB/AA)...
In this work, the modification of the surface of polypropylene (PP) with poly(3-hexylthiophene) (P3HT) was carried out using a simple two-step grafting reaction. In the first step, 3-(4-ethenylphenyl)thiophene, synthesized by Suzuki-Miyaura cross coupling, was grafted onto the PP surface using tri-n-butylborane (TBB) and oxygen molecules as the radical initiators. In the second step, oxidative polymerization,...
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