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  • 1
    Electronic Resource
    Electronic Resource
    Letters to the Editor (1980)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 26 (1980), S. 333-334 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690260241
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of the bioactive form of linear peptide antagonists at the δ-opioid receptor (1996)
    New York : Wiley-Blackwell
    Biopolymers 38 (1996), S. 759-768 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The stereochemical requirements for δ-opioid receptor binding of a series of linear peptide antagonists with a novel conformationally restricted Phe analogue (Tic) as a second residue were examined by using a variety of computational chemistry methods. The δ-opioid receptor analogues with significant affinity, Tyr-Tic-NH2 (TI-NH2), Tyr-Tic-Phe-OH (TIP), Tyr-Tic-Phe-NH2(TIP-NH2), Tyr-Tic-Phe-Phe-OH (TIPP), Tyr-Tic-Phe-Phe-NH2) (TIPP-NH2), and the low affinity δ-opioid peptides Tyr-Pro-Phe-Pro-NH2 (morphiceptin) and Tyr-Phe-Phe-Phe-NH2 (TPPP-NH2), were included in this study. The conformational profiles of these peptides were obtained by consecutive cycles of high and low temperature molecular dynamic simulations, coupled to molecular mechanical energy minimization carried out until no new conformational minima were obtained. Comparing the results for TPPP-NH2 and TIPP-NH2, the presence of the conformationally restricted Tic residue did not greatly reduce the number of unique low energy conformations, but did allow low energy conformers involving cis bonds between the first two residues. The conformational libraries of these peptides were examined for their ability to satisfy the three key ligand components for receptor recognition already identified by previous studies of high affinity cyclic (Tyr1-D-Pen2-Gly3-Phe4-D -Pen5) enkephalin (DPDPE) type agonists: a protonated amine group, an aromatic ring, and a lipophilic moiety in a specific geometric arrangement. Two types of conformations common to the five high δ-opioid affinity L-Tic analogues were found that satisfied these requirements, one with a cis and the other with a trans peptide bond between the Tyr1 and Tic2 residues. Moreover, both the Tic2 and Phe3 residues could mimic the hydrophobic interactions with the receptor of the Phe4 moiety in the cyclic DPDPE type agonists, consistent with the appreciable affinity of both di-and tripeptides. The low δ-opioid receptor affinity of morphiceptin can be understood as the result of conformational preferences that prevent the fulfillment of this pharmacophore for recognition. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of anhydrous ferric chloride with nylon 6 (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 603-610 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The interaction of anhydrous ferric chloride with nylon 6 has been inferred from Fourier transform infrared spectroscopy (FTIR), wide-angle x-ray diffraction (WAXD), thermal (DSC and TGA), and rheological (Rheometrics) measurements. At very low additive concentration of ∼0.25 wt %, an about 50-fold melt viscosity increase of nylon 6 was observed. However, progressive decrease in melt viscosity was also observed with increasing additive concentrations indicative of degradation as confirmed by the enhancement of weight loss with TGA at a lower temperature. Decrease in crystallinity content of the filled nylon samples is inferred from the reduction of the melting endotherms with DSC, pronounced reduction in diffraction intensity with WAXD, an increase in amorphous CH2 bending band (1400 cm-1) with FTIR. The above results can be attributed to the strong complex formation between the FeCl3 and the N—H groups as suggested by the subtraction spectra of FTIR where decreased intensities of the 690, 1200, and 1265 cm-1 bands were observed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260219
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  • 4
    Electronic Resource
    Electronic Resource
    The correlation between phase behavior and structure of a four-component system, poly-ethylene glycol/sodium dodecyl sulfate/pentanol/H2OThis paper was presented at the 5th International Conference on Surface and Colloid Science and the 59th Division of Colloid and Interface Science, American Chemical Society, held in Potsdam, New York, June, 1985. (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 4383-4392 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The change in the concentration of sodium dodecyl sulfate (SDS) can, in fact, affect directly the correlation between phase behavior and structure of a four-component system, polyethylene glycol/sodium dodecyl sulfate/pentanol/H2O. Experimental results indicate that the phenomena of microemulsion and lamellar liquid crystals can take place at a concentration of SDS greater than 5% and 17% by weight, respectively. In our experiments, these liquid crystals are tested and found to be hydrophilic and their rheological properties to be non-Newtonian as well.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320408
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  • 5
    Electronic Resource
    Electronic Resource
    Epoxidation of partially hydrogenated styrene-butadiene block copolymers using peracetic acid in a cyclohexane/water heterogeneous system (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1483-1491 
    Details
    ISSN: 0887-624X
    Keywords: epoxidation ; epoxide ; functionalization ; partial hydrogenation ; styrene ; butadiene ; block copolymer ; SBS ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of partially saturated lightly functionalized styrene-butadiene block copolymers of polyA-block-polyB-block-polyA type (SBS) is described. The work involves epoxidizing partially hydrogenated SBS block copolymers using peracetic acid in a cyclohexane/water heterogeneous system. Five partially hydrogenated model polymers containing low levels of unsaturated aliphatic double bonds were used to study the epoxidation reaction and kinetics. The existence of the epoxide functional group on the product polymer was evidenced by IR and 1H-NMR spectra and the epoxide concentration was determined by direct titration. The partially hydrogenated SBS copolymers were more difficult to epoxidize than the unhydrogenated ones. The temperature dependence of the epoxidation rate was studied and the activation energy was determined as 8.8 kcal/mole of double bonds. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Method of determining the degree of branching from the gel permeation chromatogram for star-shaped SBS thermoplastic block copolymers (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3393-3401 
    Details
    ISSN: 0887-624X
    Keywords: gel permeation chromatography ; star polymer ; block copolymer ; butadiene ; styrene ; silicon tetrachloride ; light scattering ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel GPC calculation method has been developed for characterizing star-shaped styrene-butadiene block copolymers (SBS). This method enables us to determine the degree of branching (number of arms per molecule) of the synthesized polymer without the need of a priori measurement of the true molecular weights of the SBS star polymer and its linear polymeric arm. To illustrate the simplicity of this method, nearly monodispersed three-arm and four-arm model star polymers have been purposely synthesized by linking living diblock polymeric arms of the polystyrene-block-polybutadiene type with silicon tetrachloride as the multifunctional linking agent. The good agreement between the degree of branching calculated from the GPC chromatogram and that actually measured by MALL (multiple angle laser light scattering) has corroborated the validity of the calculation method. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3393-3401, 1997
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of nylon-grated polyphenylene etherPresented in part at the 19th Akron Polymer Conferences on “Advances in Heterophase Polymers: Synthesis, Characterization, and Properties” (The Ralph Milkovich Memorial Symposium), Akron, OH, June 19-22, 1988. (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3371-3382 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyphenylene ether (PPE) resin (a homopolymer made from 2,6-xylenol with an i.v. of 0.46) was reacted with phenyl acrylate, p-substituted phenyl acrylates, and diphenyl fumarate in an extruder or in solution. The number of olefinic molecules that had been grafted onto the PPE backbone was determined by FTIR or NMR methods, and the grafting efficiency and mechanism were examined. The grafted PPE resins were used to promote the anionic polymerization of ε-caprolactam, and the quantity and the composition of the PPE-nylon 6 copolymers isolated were correlated with the number of promoter groups attached to the PPE resin.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271016
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrosilylation polymerization. I. A new approach to the preparation of macromonomers containing silicon atoms (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 287-291 
    Details
    ISSN: 0887-624X
    Keywords: hydrosilylation polymerization ; self-polyaddition ; silicon containing polymer ; macromonomer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310135
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  • 9
    Electronic Resource
    Electronic Resource
    A study of polypyrrole synthesized with oxidative transition metal ions (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 743-753 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polypyrrole powder and films were chemically synthesized by the reaction of AgNO3, FeCl3, Fe(NO3)3, Cu(NO3)2, or Cu(NO3)2-AlCl3 with pyrrole in an aqueous solution or a water - toluene two-phase system. Products were characterized by elemental analysis, IR, scanning electron microscopy with energy dispersive x-ray analysis (SEM with EDAX), and conductivity measurements. The polypyrrole synthesized from pyrrole with FeCl3 had a composition of C4.00H3.05N0.99Cl0.25. The pressed powder had a conductivity of 2.7 × 10-2 S/cm and the film 2.8 S/cm. All the other metal salts produced films that had the same organic backbone, morphology, and conductivity as the polymer synthesized using Fe(III) salts, regardless of the considerable differences in the reduction potentials of the metal ions. The nature of the anions of the transition metal salts had no effect on the reaction. Anions, however, were retained as the counterions of the cationic polypyrrole backbone and could be easily exchanged with other anions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260306
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and evaluation of photolytically and thermally crosslinkable polyimide copolymers with diacetylene functionality (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 1209-1220 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The polyimide block copolymers with diacetylene functionality were prepared in a two-step process: (1) oligomeric imide formation terminated with 1-amino-3-ethynylbenzene, and (2) oxidative coupling of the acetylene-terminated polyimides with p- and/or m-diethynylbenzene or bispropargyl ether of Bisphenol A to form block copolymers, or oxidative coupling within themselves in the presence of a copper (I) catalyst. The resulting copolymers were crosslinked with UV irradiation or thermal treatment. The thermal crosslinking process and the thermal stability of the crosslinked materials were studied by differential scanning calorimetry (DSC) and isothermal gravimetric analysis (IGA), respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080280521
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