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This work addresses the detailed molecular dynamic behavior of miscible blends of Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and their pure counterparts by quasi-elastic neutron scattering measurements (QENS). The study provides the measure of relaxation processes on pico-to-nanosecond time scales. A single relaxation process was observed in pure P3HT and PCBM...
Synthetic resins are used for various applications including in paint industry to improve the glossiness, adhesiveness, hardness, and dryness of paints. Resins are essentially polymers, which are builds up from simple molecules or monomers and can be prepared mainly by either addition polymerization or condensation polymerization. Ketones and aldehydes can be converted to resinous products by condensation...
Photoinduced atom transfer radical polymerization (ATRP) has promising applications because it requires small amounts of transition metal catalysts and low temperatures, and can be extended to numerous monomers. We investigated the photoinduced ATRP of 2-methacryloyloxyethyl phosphorylcholine (MPC) in a polar medium and prepared block-type copolymers with a poly(MPC) segment. Polymerizations in methanol...
Blends of elastic polyurethane (PU) and conductive polyaniline (PANI) were assessed for such improved electromechanical properties that are promising for further application in actuators, sensors and energy conversion. For the experiments, electrostrictive polyurethane blends were prepared with varied PANI contents. These blends were prepared with two alternative solvents, namely N,N-dimethylformamide...
We demonstrate that the cross-linker geometries such as molecular length and functionality have a pronounced effect on the orientation coupling between the dangling mesogens and network backbones in the side-chain type liquid crystal elastomers which are made by the copolymerization of mono-functional mesogens and multi-functional non-mesogenic cross-linkers. For the nematic elastomers (NEs) with...
Layer multiplying coextrusion was employed to produce films consisting of alternating layers of unfilled and particulate filled polymers, i.e., low density polyethylene (LDPE) and maleic anhydride grafted linear low density polyethylene (LLDPE-g-MA)/organoclay nanocomposites. Layer multiplying coextrusion was employed to produce gas barrier films consisting of alternating layers of unfilled and particulate...
Niobium complex was successfully introduced into atom transfer radical polymerization (ATRP) system as a new kind of recyclable photocatalyst. The niobium complex acted as photocatalyst that could be activated by the photoredox reaction under visible light irradiation and ethyl 2-bromoisobutyrate (EBiB) was used as initiator. Successful ATRP polymerizations of acrylates were realized. The well-defined...
Photochromic fluorescent uniform micrometer-sized particles were prepared in two ways: (1) Swelling of polystyrene (PS) and poly(styrene-butylmethacrylate) (P(S-BMA)) template particles with spiropyran dye (FSP) to obtain PS/FSP and P(S-BMA)/FSP uniform particles; (2) A similar swelling process, replacing FSP by AIBN, styrene and a spiropyran monomer (MSP), followed by co-polymerization of the monomers...
A series of narrowly distributed diblock copolymers composed of amorphous components and side-chain liquid crystalline (LC) polymer, poly (butyl acrylate)-block-poly [8-(4-cyano-4′-biphenyl)-1-octanoyl acrylate] (PBA-b-PCBOA), with side-chain LC block weight fraction (fw,PCBOA) ranging from 25% to 87%, were synthesized by atom transfer radical polymerization (ATRP). Their thermal property, LC behavior,...
Activated by [Ph3C][B(C6F5)4], dimethylpyridylamidohafnium complex exhibited high performance in the copolymerization of propylene with 3,3-dimethyl-3-sila-1,5-hexadiene (DMSHD), producing high molecular weight random copolymers without pendent vinyl groups and cross-linking. The effects of the comonomer incorporation on chain microstructure, crystallinity, thermal properties and final mechanical...
Electrospun polyacrylonitrile (PAN) copolymer nanofibers (particularly those after the post-spinning stretching process) are expected to be an innovative type of precursors for making continuous carbon nanofibers with superior mechanical properties. In this study, three types of unidirectionally aligned PAN-based nanofibers including homo-PAN, binary-PAN (a PAN copolymer with itaconic acid units),...
A series of branched and folic acid (FA) conjugated amphiphilic block copolymers were synthesized by sequential steps of ring opening and atom transfer radical polymerizations. The chemical structure of the FA conjugated block copolymer was established by spectroscopic method. The FA conjugated copolymers give rise to nearly spherical polymeric micelles (PMs) in water (40–60 nm). The polymers are...
A kind of fluorinated and epoxy-terminated low-molecular-weight bisphenol A polycarbonate (FBPA-PC EP) was synthesized by solution polymerization of 4, 4′-(hexafluoro-isopropylidene) diphenol (6F-BPA) with triphosgene (BTC) and further reacted with epoxy chloropropane. The structure of the polymer was confirmed by FTIR, 1H NMR, 13C NMR and 19F NMR spectra. A series of negative-type fluorinated photoresists...
Nanostructured gratings of semicrystalline poly(propylene azelate) (PPAz) have been prepared over spin-coated thin films by Nanoimprint Lithography (NIL). The structure and morphology of the gratings have been investigated by combining Atomic Force Microscopy (AFM) and Grazing Incidence X-ray Scattering at small angle (GISAXS) and wide angle (GIWAXS). The results reveal that NIL affects significantly...
For tissue engineering, pore structure is an essential element in the development of scaffolds. In this paper, we obtained highly porous cross-linked partially hydrolyzed poly (vinyl alcohol) (PVA) hydrogels by templating concentrated CO2-in-water (C/W) emulsions, which avoid the use of traditional organic solvents and additional surfactants. This method is very convenient for the formation of biocompatible...
We report a simultaneous study in self-seeding and isothermal crystallization of polyethylene (PE) in the solution using time resolved small angle neutron scattering (SANS). We observe that the SANS spectra obtained from self-seeding technique are significantly different from isothermal crystallization technique of PE crystallization in solution. The first correlation peak from structure factor for...
The phase morphology in impact polypropylene was studied by size exclusion chromatography (SEC), differential scanning calorimetry (DSC), and solid-state nuclear magnetic resonance (NMR). The characterizations of the raw copolymer materials indicate the presence of amorphous and crystalline phases. In order to gain more comprehensive insight in the microstructure of these materials, four different...
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