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In this work, the forming condition and mechanism of the β conformation in poly (9,9-dioctylfluorene) (PFO) solution are studied. We find the forming condition of β conformation is strongly associated with the proportion of the poor solvent (ethanol) in mixed solution (toluene/ethanol). When the proportion of poor solvent is less than 40% (volume ratio), there is no β conformation in solution; but...
An attempt to prepare graft copolymer of natural rubber, NR and poly(stearyl methacrylate), PSMA, was made to improve mechanical properties of NR, since the grafted PSMA was composed of crystallizable stearyl groups as a nucleating agent and methacrylate units. The graft-copolymerization of stearyl methacrylate (SMA) onto deproteinized natural rubber (DPNR) was performed in latex stage with tert-butylhydroperoxide...
The combination of magnetic resonance imaging (MRI) and fluorescent imaging with a dual-modal probe could exert the advantages of the two imaging techniques, simultaneously achieving high spatial resolution and sensitivity in tumor diagnosis. Herein, a magnetic and fluorescent dual-modal nanoprobe of ca. 8 nm was prepared through self-assembly of a star-like polymer comprising of porphyrin core, gadolinium...
Cyclodextrin-based star polymers were synthesized using functionalized β-cyclodextrin (β-CD) core, and n-butyl acrylate (BA) as hydrophobic arms. The β-CD core macroinitiator was prepared by the transesterification reaction of β-CD with 2-bromoisobutyryl bromide. The core-first method was chosen as the synthetic strategy as it allows good control over the polymer architecture. Star-shaped amphiphilic...
Effects of the compounding equipment, the viscosity of the matrix, and the annealing on the electrical resistivity of polycarbonate (PC)/MWCNT nanocomposites were investigated. Two different types of compounding equipment (a batch mixer and a twin screw extruder) produced a huge difference in the resistivity in an injection molded PC/MWCNT nanocomposite while the resistivity of compression molded...
In this study, the key factors for controlling the average fiber diameter and diameter distribution of fibers made via simultaneous centrifugal spinning and UV initiated polymerization are elucidated. Through systematic investigation, it was found that the average fiber diameter has a strong dependence on monomer delivery rate through the orifice, which can be intuitively linked to both the orifice...
Poly(ester–sulfone) was synthesized via a thiol-ene click reaction between bis(butenyl) methylsuccinate and 1,4-butanedithiol, and the product poly(ester–sulfone) was found to move to the anode selectively in electrophoretic deposition (EPD) on stainless steel. To clarify the electrophoretic mechanism, dispersions consisting of poly(ester–sulfone) and various protic solvents were prepared, and EPD...
A series of reactive blends, comprising a commercial benzoxazine monomer, 2,2-bis(3,4-dihydro-3-phenyl-2H-1,3-benzoxazine)propane, and bisphenol A is prepared and characterized. Thermal analysis and dynamic rheology reveal how the introduction of up to 15 wt % bisphenol A lead to a significant increase in reactivity (the exothermic peak maximum of thermal polymerization is reduced from 245 °C to 215 °C),...
A comparative study was conducted to determine the effects of fullerene on the thermo-mechanical properties of Araldite LY 5052/Aradur HY 5052 cross-linked resin epoxy by molecular dynamics simulations. Different from ordinary epoxy resins, Araldite LY 5052/Aradur HY 5052 cross-linked resin epoxy is composed of four compounds that provide different thermal and mechanical properties. The thermo-mechanical...
We studied the segmental dynamics of poly(methyl methacrylate) (PMMA) in multi-layered films with polycarbonate (PC) having layer thicknesses as small as 4 nm. Such a design provides macroscopic dimensions enabling macroscopic measurements, while maintaining nm-scale confinement. Of particular significance, we were able to determine correlation length scales for the polymer under nanoconfinement....
Research interest in electrochemical redox stimulus has grown considerably due to its easy trigger mode, in which the linkers have played important roles, such as the β-cyclodextrin-ferrocene (β-CD-Fc) linker. Star amphiphilic copolymers with well-defined and flexible structures are considered to be excellent choices for drug delivery systems (DDSs). Driven by the idea that using star polymers to...
High temperature triggered multiple-shape memory poly(benzoxazole-co-imide)s with adjustable properties were prepared via facile random copolymerization 3,3′,4,4′-biphenyltetracarbolylic dianhydride (BPDA) with two different diamine of 4,4′-oxydianiline (ODA) and 5-amino-2-(4-aminobenzene) benzoxazole (BOA). The effect of polybenzoxazole on the molecular packing, physical properties and shape memory...
Polythiophene-graft-poly(methyl methacrylate) (PT-g-PMMA) functionalized non-covalently with reduced graphene oxide(RGO) (PFG) is used to make composites with poly(vinylidene fluoride) (PVDF), designated as PRPx where x represents PFG content(wt%). RGOs are distributed homogenously in PVDF matrix. FTIR spectra indicate 90% piezoelectric β-polymorph in PRP5. Thermal studies exhibit small decrease of...
This work describes the phase behavior of blends of ‘polyethylene-like’ polypentadecalactone (PPDL) and polyethylene. Blends of high-density polyethylene (HDPE) and PPDL were shown to be immiscible at the onset of crystallization of polyethylene, resulting in phase-separated morphologies. However, epitaxial crystallization of PPDL onto the HDPE crystals was observed by transmission electron microscopy...
The studies on the interaction between thermo-responsive polymer PNIPAM and various ionic surfactants have been extensively investigated in the past few years. Unfortunately, the role of the hydrophobic end-group which is inevitably introduced by the initiator or chain transfer agent was generally overlooked in related studies. In this work, to show the interplay between the hydrophobic end-group...
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