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  • ALTITUDE; Baseline Surface Radiation Network; BIL; Billings; BSRN; DATE/TIME; Dew/frost point; Monitoring station; MONS; Oklahoma, United States of America; Pressure, at given altitude; Radiosonde, Vaisala, RS80-15LH; Temperature, air; Wind direction; Wind speed  (157)
  • Polymer and Materials Science  (88)
  • Earth Resources and Remote Sensing
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  • 11
    Electronic Resource
    Electronic Resource
    Epoxy modified polyurethane rigid foams (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 29 (1991), S. 1083-1088 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rigid IPN foams were prepared by sequential polymerization of polyurethane and epoxy systems. Significantly higher compressive modulus and strength were observed with the IPN foams in comparison to the corresponding polyurethane rigid foams. The IPN foams show one glass transition temperature. The single Tg indicates the very small domain size in the PU-epoxy IPN's.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1991.080290801
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  • 12
    Electronic Resource
    Electronic Resource
    Thermogravimetric analysis of poly(alkyl methacrylates) and poly(methylmethacrylate-g-dimethyl siloxane) graft copolymers (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 1747-1753 
    Details
    ISSN: 0887-624X
    Keywords: poly(methyl methacrylate) ; polydimethylsiloxane ; thermogravimetric analysis (TGA) ; graft copolymers ; poly(alkyl methacrylates) ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal stabilities of various poly(alkyl methacrylate) homopolymers and poly(methyl methacrylate-g-dimethyl siloxane) (PMMA-g-PSX) graft copolymers have been determined by thermogravimetric analysis (TGA). As expected, the thermal stabilities of poly(alkyl methacrylates) were a function of the ester alkyl group, and polymerization mechanism. In particular, thermally labile linkages, which result from termination during free radical or nonliving polymerization mechanisms, decrease the ultimate thermal stabilities of the polymers. However, graft copolymers, which were prepared by the macromonomer technique with free radical initiators, exhibited enhanced thermal stability compared to homopolymer controls. A more complex free radical polymerization mechanism for the macromonomer modified polymerization may account for this result. © 1994 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320917
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  • 13
    Electronic Resource
    Electronic Resource
    Hindered lithium dialkylamide initiators for the living anionic polymerization of methacrylic esters (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2425-2430 
    Details
    ISSN: 0887-624X
    Keywords: anionic ; polymerization ; living ; methyl methacrylate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithium diisopropylamide is an efficient initiator for the anionic polymerization of methyl methacrylate in polar solvents at -78°C. Predictable molecular weights based on the initiator concentration were obtained, yields were quantitative, and molecular weight distributions were relatively narrow (〈1.30). The presence of an amino end group and confirmation of the initiation mechanism were confirmed by potentiometric titration using HClO4. Number-average molecular weights determined by titration agreed well with values determined by SEC. Other lithium dialkylamides that contain larger alkyl groups such as lithium diisobutylamide were less efficient initiators. This was attributed to the more nucleophilic anion due to less steric hindrance near the nitrogen atom. Molecular weight distributions were significantly broadened (〉2.0), and molecular weight control was not achieved. However, polymer yields were quantitative. In all cases, PMMA stereochemistry was indicative of a solvent-separated lithium counterion, and triad compositions were identical to organolithium initiated homopolymers, i.e., 78% syndiotactic, 20% heterotactic, and 2% isotactic. © 1994 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321303
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  • 14
    Electronic Resource
    Electronic Resource
    Inorganic salts as additives in accelerating the photografting of styrene to cellulose and polyethylene (1986)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 125-129 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1986.140240306
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  • 15
    Electronic Resource
    Electronic Resource
    Production of organometallic polymers by the interfacial technique. XXV. Synthesis of oligomeric silylhydrazines (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 160 (1972), S. 251-258 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Grenzflächenpolykondensation von Silanen mit Hydrazinen wurden Polymere der Struktur I hergestellt. Dabei kam ein modifiziertes wasserfreies Lösungsmittelsystem aus Acetonitril und Kohlenwasserstoffen zur Anwendung.Die Produkte haben nur niedrige Molekulargewichte. Eine Zuordnung der IR-Banden wird gegeben.
    Notes: Polymers of the form below were prepared by the interfacial method via the condensation of silanes with hydrazines employing a modified nonaqueous system using acetonitrile and liquid hydrocarbons. IR frequency band assignments are given. The products are oligomeric.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021600119
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  • 16
    Electronic Resource
    Electronic Resource
    Synthesis of poly-O-acyl-amideoximes containing group IV A metals from poly(acrylonitrile) (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 152 (1972), S. 43-47 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Umsetzung von Polyacrylnitril mit Hydroxylamin und dann mit Organometallhalogeniden von Sn, Ge oder Si wurden modifizierte Polymere erhalten, die wahrscheinlich folgende Struktur aufweisen: Mit Cl2MR2 entstehen vernetzte Produkte. Die neuen Polymeren werden kurz charakterisiert.
    Notes: Poly(acrylonitrile) was modified to give products of the form below via reaction with hydroxylamine and subsequently with group IV organometallic reactants: The products obtained with Cl2MR2 are crosslinked. Properties of the new polymers are briefly characterized.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021520106
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  • 17
    Electronic Resource
    Electronic Resource
    Temperature-correlated force and structure development in elastomeric polypeptides: The Ile1 analog of the polypentapeptide of elastin (1986)
    New York : Wiley-Blackwell
    Biopolymers 25 (1986), S. 1939-1953 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Ile1 analog of the polypentapeptide of elastin, (L · Ile1-L · Pro2-Gly3-L · Val4-Gly5)n, abbreviated as Ile1-PPP, was synthesized with n 〉 100 to determine the effect of the increased hydrophobicity of the pentamer resulting from Val1 replacement by Ile1 on the previously characterized inverse temperature transition of the polypentapeptide of elastin (PPP). Ile1-PPP, dissolved in water at 4°C, was found to aggregate, forming a viscoelastic coacervate on raising the temperature. The onset of aggregation was 8°C for Ile1-PPP, as compared to 24°C for PPP. Characterization by CD demonstrated an increase in intramolecular order on raising the temperature from 8°C to 25°C, and demonstrated similar conformations for PPP and Ile1-PPP before and after their respective transitions. The CD-characterized transition also occurred at a temperature some 15°C lower than that of PPP. By means of 20-Mrad γ-irradiation cross-linking of the Ile1-PPP coacervate, an elastomeric matrix was formed with an elastic modulus, similar to that of 20-Mrad cross-linked PPP. The temperature dependence of elastomeric force of cross-linked Ile1-PPP showed an abrupt increase from essentially zero at 8°C to three-quarters of full force at 10°C and essentially full force by 20-25°C. This development of elastomeric force for the more hydrophobic Ile1-PPP matrix, which parallels the increase in intramolecular order characterized by the CD studies, also occurs at a temperature some 15°C lower than that for the PPP matrix. Thus, in these elastomeric polypeptides, development of elastomeric force is coupled to an inverse temperature transition, the temperature of which depends inversely on the hydrophobicity of the constituent pentamer. It appears that a series of elastomeric polypeptide biomaterials are possible in which the temperature over which elastomeric force develops can be varied.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360251009
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  • 18
    Electronic Resource
    Electronic Resource
    Atypical gly-X-Y sequences surround interruptions in the repeating tripeptide pattern of basement membrane collagen (1995)
    New York : Wiley-Blackwell
    Biopolymers 35 (1995), S. 621-628 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The triple-helical domains of type IV collagen chains have more than 20 sites at which the repeating (Gly-X-Y)n pattern is interrupted. Analysis of α1 (IV) and α2 (IV) chains indicates the residues in the three Gly-X-Y triplets preceding or following interruptions differ statistically from the rest of the chain. Unusually high frequencies of charged residues are seen at a number of X and Y sites, with the charge density being particularly high C-terminal to the interruption site. Analyses were carried out on individual categories of interruptions, classified as insertions or deletions in the Y position. All of the residues in the X and Y positions of the triplets flanking insertion sites are atypical, with a high concentration of charged residues. Triplets flanking sites where there has been a deletion in the Y position show unusually high frequencies of charged residues at some sites, hydrophobic residues at other sites, and an invariant imino acid N-terminal to the interruption. The presence of atypical sequences surrounding interruptions could be important at a molecular level, related to triple-helix stability, or at a supramolecular level, related to the association of molecules to form networks in basement membranes. © 1995 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360350608
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  • 19
    Electronic Resource
    Electronic Resource
    NMR and CD studies of triple-helical peptides (1992)
    New York : Wiley-Blackwell
    Biopolymers 32 (1992), S. 447-451 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Triple-helix formation of the peptide (Pro-Hyp-Gly)10 was monitored by nmr and CD spectroscopy. The two-dimensional nmr spectra indicated that the Gly Cα H and Pro CδH proton resonances shift upfield in going from the nonhelical to helical form, while hydroxyproline resonances are unchanged. The integrated areas of the helical and nonhelical resonances could be monitored in the one-dimensional nmr spectrum, and indicate that in the (Pro-Hyp-Gly)10 about 90% of the residues are in a defined triple-helical conformation. The introduction of a glycine to alanine substitution or the deletion of a single hydroxyproline residue in the stable triple-helical peptide (Pro-Hyp-Gly)10 still allows trimers to be formed, but the trimers show a substantial loss of triple helix and decreased thermal stability compared with (Pro-Hyp-Gly)10. Two computer models were generated for the Gly → Ala peptide, one with the Ala side chains packed inside the helix and the other with the region containing the alanines forming a β-bend that loops out from the helix. The nmr data is more consistent with the latter model.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360320423
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  • 20
    Electronic Resource
    Electronic Resource
    Measurement of long-range2 13C-1H coupling constants of 95% uniformly 13C-labeled polysaccharide from streptococcus mitis J22 (1994)
    New York : Wiley-Blackwell
    Biopolymers 34 (1994), S. 1327-1338 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The coaggregation of Streptococcus mitis strain J22 in the early stages of dental plaque formation has been shown to result from interaction of cell wall polysaccharides with lectins on the surface of other oral bacterial species. This bacterium was grown in a medium containing 13C as the sole carbon source. We have isolated the lectin receptor polysaccharide from this strain with full enrichment in 13C and have determined a number of two-bond and three-bond 13C-1H coupling constants from measurements of the offsets in two-dimensional homonuclear nmr spectra [exclusive correlated spectroscopy (E-COSY) method]. A scheme for reliable extraction of these coupling constants from homonuclear Hartmann-Hahn and nuclear Overhauser effect spectroscopy spectra is tested in model compounds. We interpret the three-bond coupling across the glycosidic linkage in terms of dihedral angles in order to provide conformational information to supplement molecular modeling and nuclear Overhauser effect data. We show that the E-COSY method works well even for coupling constants smaller than the nmr line width and that a number of the 3JCH across the glycosidic linkage are in the range of 1-2 Hz, which is much smaller than many previously reported values. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360341005
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