Materials Literature
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Abstract Tamarind Kernel Powder (TKP) is derived from the seeds of Tamarindus indica Linn., a common and most important tree of India. It is extensively used in cotton sizing, as a wet‐end additive in the paper industry, as a thickening, stabilizing, and gelling agent in the food industry. However, because of its fast…
Abstract The photoinitiated crosslinking of halogen‐free flame‐retarded ethylene‐vinyl acetate copolymer (EVA) by the phosphorous‐nitrogen compound NP28 in the presence of photoinitiator and crosslinker and characterization of the related properties have been investigated by gel determination, heat extension test, the…
Abstract A novel method was used to investigate the mechanism of Sn(Oct) 2 ‐catalyzed ε‐caprolactone polymerization by using Sn(Oct) 2 /BF 3 dual catalyst. The bulk polymerization was conducted at 110 and 130°C with different Sn(Oct) 2 /BF 3 ratios. The polymerization kinetics was followed using gel permeation chromat…
Abstract Low‐density polyethylene (LDPE) was melt‐blended with native cassava starch in an internal mixer. The unplasticized starch content was in the range of 30–70 wt %. Potassium persulfate and benzoyl peroxide were used as initiators to generate free radicals in starch and LDPE, leading to graft copolymerization d…
In this Brief Report, we analyze the superconducting properties of doped single- and double-layer graphene systems by taking into account the fluctuations of the superconducting order parameter. Our analysis is rather general, and corresponds to a phenomenological electron-electron (hole-hole) attraction defined by it…
We demonstrate that in graphitic nanocarbon materials, combination of ballistic conductivity and strong electron photon coupling opens a unique opportunity to observe transfer of momentum of the electromagnetic radiation to free carriers. The resulting drag of quasiballistically propagating electrons can be employed,…
Abstract The reaction mechanism of decomposition process and the kinetic parameters of the poly( n ‐butyl methacrylate‐b‐styrene), poly(nButMA‐b‐St), diblock copolymer synthesized by atom transfer radical polymerization (ATRP) were investigated by thermogravimetric analysis (TGA) at different heating rates. TGA curves…
We investigated the electrical conduction and dielectric relaxation of reduced Cr-doped SrTiO3−δ thin films. The electrical conduction behavior indicates the formation of small polarons in oxygen deficient Cr-doped SrTiO3−δ thin films. The associated dielectric relaxation further indicates nonadiabatic small polaron t…
To clarify the nature of optical absorptions in polyimides (PIs), the ultraviolet-visible optical absorption spectra of PI thin films were observed at high pressures up to 400 MPa using a custom-built hydrostatic pressure optical cell. A pressure-induced bathochromic shift with increasing bandwidth was observed in the…
Abstract In this study, the chemical modification of unsaturated polyesters and the influence of polyester's structure on thermal and viscoelastic properties have been presented. The structure of unsaturated polyesters obtained in polycondensation of cyclohex‐4‐ene‐1,2‐dicarboxylic anhydride (THPA), maleic anhydride a…
Abstract 9,9‐Bis(4‐hydroxyphenyl)xanthene (BHPX), a bisphenol monomer, was synthesized in 82% yield from xanthenone in a one‐pot, two‐step synthetic procedure. Four novel aromatic poly(ether ketone)s (PEKs) based on BHPX were prepared via a nucleophilic aromatic substitution polycondensation with four difluorinated ar…
Abstract Aiming to improve the hydrophilicity, antibacterial activity, cytocompatibility, and hemocompatibility of poly(butyleneadipate‐ co ‐terephthalate) (PBAT) films, PBAT films were treated with ozone, grafted with chitosan (CS), and followed by covalent immobilization of either heparin (HEP) or hyaluronic acid (H…
The electronic structure of vortex states in superconducting graphene is studied within the Bogoliubov--de Gennes theory applied to excitations near the Dirac point. We consider the subgap spectrum transformations which occur with a change in the doping level. For an arbitrary vorticity and doping level we investigate…
Abstract A new method to prepare porous silk fibroin (SF) membranes without dialysis is proposed. Silk fibers were degummed to remove sericin and the resultant fibroin was dissolved in a CaCl 2 ‐CH 3 CH 2 OH‐H 2 O ternary solvent. Rather than undergoing dialysis, a fibroin salty solution was diluted in water and then…
Reaction pathways leading to the new mixed substituent cyclophosphazenes, N(3)P(3)Cl(4)(OCH=CH(2))(OCH(2)CF(3)) and N(3)P(3)Cl(3)(OCH=CH(2))(OCH(2)CF(3))(2), have been explored. Examination of the relative isomeric yields and the spectroscopic properties of these new derivatives gave insight into the mechanism of subs…
A simple and reliable one-step technique is developed to form robust PAMAM dendrimer–gold nanoparticle nanocomposites using dithiocarbamate-based chemistry. The interparticle spacing and optical properties of films can be readily tuned by controlling the dendrimer generation and/or the mole ratio between dendrimers an…
Abstract Poly(vinyl alcohol) (PVA) is an important water‐soluble polymer. Its many applications (e.g., textile sizing, dispersants, and adhesives) greatly depend on its water solubility and particularly on its dissolution rate in water. In this study, urea, combined with methanol, was adopted to improve the water solu…
Highly cross-linked polymer (HCP) networks are becoming increasingly important as high-performance adhesives and multifunctional composite materials. Because of their cross-linked molecular architectures, HCPs can be strong but brittle. One key goal in improving the performance of an HCP is to increase toughness witho…
We have discovered that poly(ethylenimine)-capped Au nanoparticles can be fabricated into a two-dimensional film by adding toluene into the colloidal solution. The Au nanoparticle film layer creeps up the glass wall of the vial after adding benzenethiol into the toluene phase, thus allowing for a robust Au film to for…
A hybrid colloidal CdTe nanocrystal/bulk GaAs p-i-n heterostructure is demonstrated to have potential for highly efficient light harvesting photovoltaic devices. An array of rectangular channels is fabricated on the surface of the GaAs heterostructure penetrating through its active layer and subsequently filled with w…