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In this work, we reported the synthesis of a series of novel semicrystalline ABA triblock copolymers with polyethylene midblock and polystyrene endblocks via the combination of ring-opening metathesis polymerization (ROMP), hydrogenation and reversible addition-fragmentation chain transfer (RAFT) polymerization. First, an α,ω-dihydroxyl-terminated polycyclooctadiene (PCOD) was synthesized via the...
A series of organic-inorganic polybenzoxazine (PBZ) copolymers with double deck silsesquioxane (DDSQ) in the main chains were synthesized via Mannich polycondensation. First, 3,13-dianilino DDSQ, a well-defined polyhedral oligomeric silsesquioxane (POSS) diamine was synthesized. Thereafter, this POSS diamine together with 4,4-diaminodiphenylmethane was utilized to react with 4,4’-dihydroxyldiphenylisopropane...
A series of hierarchically structured porous polyureas are prepared through the polymerization of diisocyanate monomers and H2O via a one-step and template-free strategy. This simple archetypal reaction combines carbon dioxide foaming process and hyper-crosslinking reaction. The obtained hierarchically porous polyureas (HPUs) consist of micro- and mesopores created by hyper-crosslinking reaction,...
A series of hybrid microporous polymers (HMPs) were prepared through Friedel-Crafts reaction with double-decker-shaped silsesquioxane as the building block. The ratio between the monomer and the crosslinker has significant influence on the surface area and porous morphology. A maximum BET surface area of 923 m2 g−1 and high gas storage capacity (CO2:10.4 wt%, 273 K/1.0 bar; H2: 0.95 wt%, 77 K/1.0 bar)...
In this contribution, we reported the preparation of the nanostructured epoxy thermosets containing poly(N-vinylcarbazole) (PVK) microdomains. Toward this end, we first synthesized poly(N-vinylpyrrolidone)-block-poly(N-vinylcarbazole)-block-poly(N-vinyl pyrrolidone) (PVPy-b-PVK-b-PVPy) triblock copolymer via sequential reversible addition-fragmentation chain transfer/macromolecular design via the...
Poly(ε-caprolactone)-block-polystyrene-block-poly(2,2,2-trifluoroethylacrylate (PCL-b-PS-b-PTFEA) and poly(ε-caprolactone)-block-poly(2,2,2-trifluoroethyl acrylate)-block-polystyrene (PCL-b-PTFEA-b-PS) triblock copolymers were synthesized via the combination of ring-opening polymerization (ROP) and reversible addition-fragmentation chain transfer (RAFT) polymerizations. Both of the triblock copolymers...
In this contribution, we reported the synthesis of a core-shell cylindrical brush copolymer with poly(2-hydroxyethyl methacrylate) (PHEMA) backbone and polystyrene-block-poly(ε-caprolactone) (PS-b-PCL) diblock side chains [denoted PHEMA-g-(PS-b-PCL)n] with the combination of atom transfer radical polymerization, the Huisgen 1,3-dipolar cycloaddition between azido and alkynyl groups and the ring-opening...
The nanostructured thermosets containing poly(3-hexylthiophene) (P3HT) nanophases were prepared by incorporating poly(ε-caprolactone)-block-poly(3-hexylthiophene)-block-poly(ε-caprolactone) (PCL-b-P3HT-b-PCL) triblock copolymer into epoxy. The PCL-b-P3HT-b-PCL triblock copolymer was synthesized via the combination of the polycondensation of 2-bromo-3-hexyl-5-iodothiophene and the ring-opening polymerization...
We report a facile synthetic approach to a new type of catechol containing UV dimantlable adhesive. A series of linear polymers containing pendent catechol moieties and main chain o-nitrobenzyl ester groups were synthesized by the Passerini multicomponent polymerization (MCP) of a di-o-nitrobenzaldehyde, 1,6-diisocyanohexane, 3-(3,4-dihydroxyphenyl) propionic acid, and undecanoic acid. The content...
Poly(ε-caprolactone)-block-poly(N-vinyl pyrrolidone) diblock copolymers grafted from macrocyclic oligomeric silsesquioxane (MOSS) (denoted MOSS[PCL-b-PVPy]12) were synthesized via the sequential polymerizations involving ring-opening polymerization (ROP) of ε-caprolactone (CL) and RAFT/MADIX polymerization of N-vinyl pyrrolidone (NVP). The organic-inorganic brush-like diblock copolymers were characterized...
In this work, we investigated the effect of formation mechanisms of nanophases on the morphologies and thermomechanical properties of the nanostructured thermosets containing block copolymers. Toward this end, the nanostructured thermosets involving epoxy and block copolymers were prepared via self-assembly and reaction-induced microphase separation approaches, respectively. Two structurally similar...
Periodic copolymers of ethylene and vinyl alcohol (EVA) were synthesized via acyclic diene metathesis (ADMET) polymerization of a series of structurally symmetric α,ω-diene monomers that containing two vinyl acetate (VAc) units, followed by exhaustive hydrogenation and subsequent hydrolysis. This synthetic methodology provided a new type of EVA copolymer with defined sequence and ever highest VA content...
In this work, we reported the synthesis of poly(N-isopropyl acrylamide)-block- poly(N-vinylpyrrolidone)-block-poly(N-isopropylacrylamide) triblock copolymer (PNIPAAm-b-PVPy-b-PNIPAAm) via reversible addition-fragmentation chain transfer polymerization/macromolecular design via the interchange of xanthate (RAFT/MADIX) process. This approach was further employed to prepare the PNIPAAm-b-PVPy block copolymer...
Controlling crystal phase transition from modification II to I in isotactic Poly-1-butene (iPB-1) using CO 2 is presented in this article. The intrinsic kinetics of CO 2 -induced phase transition from modification II to I in iPB-1 at 40 °C and different CO 2 pressures were detected using in situ high-pressure Fourier transform infrared spectroscopy (FTIR) and correlated by...
We report on the synthesis and properties of aqueous poly(N-vinylcaprolactam-co-acetoacetylethylmethacrylate-co-vinylimidazole) microgels with controlled degree of hydrophobic modification. Water-insoluble wedge-shaped sulfonic acid molecules with alkyl chains of different lengths were integrated into microgels via acid–base interaction. Hydrophobized microgels retain their colloidal stability in...
In this work, we found a new method to obtain isotactic poly-1-butene (iPB-1) with form I′ through direct melt-crystallization using high-pressure CO 2 . The non-isothermal melt-crystallization behaviors of iPB-1 under atmospheric N 2 and 0.5–10MPa CO 2 at cooling rates ranging from 0.25 to 5°C/min were carefully studied using high-pressure differential scanning calorimeter...
In-situ high-pressure FTIR was used to investigate the polymorphous phase transition of isotactic poly-1-butene (iPB-1) with form III upon annealing at temperatures ranging from 75 to 100 °C and CO 2 pressures ranging from 2 to 12 MPa. It was shown that the phase transition of form III changed from form III to II not through form III to I′ with increasing temperature and application of CO...
The solid-solid crystalline transformation of isotactic polybutene-1 (iPB-1) from tetragonal form II to hexagonal form I could be accelerated by supercritical carbon dioxide (scCO 2 ). In this study, in-situ Fourier transform infrared spectroscopy (FTIR) and two dimensional correlation spectroscopy (2DIR) is used to observe and investigate the crystallization behaviour of iPB in scCO 2...
Nanocomposite fibers of nylon-6 and an organically modified montmorillonite (O-MMT), Cloisite-30B, were prepared by electrospinning. Dispersion and exfoliation of O-MMT in nylon-6 were achieved by melt-extrusion in a twin-screw extruder prior to dissolving in aqueous formic acid for electrospinning. The effects of O-MMT layers on the properties of the nylon-6 solution and electrospun nanocomposite...
Ultra-fine polyelectrolyte fibers have been generated from electrospinning of poly(acrylic acid) in aqueous and DMF solutions. The fiber diameters ranged from 80 to 500nm and increased with increasing solution concentrations and electrospinning voltages. The fibers generated from the aqueous solutions were more homogeneous in sizes, especially when NaCl or NaOH was added. Higher voltages in electrospinning...
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