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  • 1
    Electronic Resource
    Electronic Resource
    On the Intrinsic Viscosity of Poly(macromonomer)s (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 1662-1664 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00084a061
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  • 2
    Electronic Resource
    Electronic Resource
    Self-Assembly of Nano-Sized Arrays on Highly Oriented Thin Films of Poly(tetrafluoroethylene) (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3525-3527 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3525.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Three-Dimensional Dispersion of Nano-Fillers in Soft Composite as Revealed by Transmission Electron Microscopy/Electron Tomography (3D-TEM) (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 514-516 (May 2006), p. 353-358 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: . Generally rubber products are a typical soft material, and a composite of a nano-filler (typically, carbon black or particulate silica) and a rubber (natural rubber and various synthetics are used). The properties of these soft nano-composites have been well known to depend on the dispersion of the nano-filler in the rubbery matrix. The most powerful tool for the elucidation of it has been transmission electron microscopy (TEM). The microscopic techniques are based on the projection of 3-dimensional (3D) body on a plane (x, y plane), thus the structural information along the thickness (z axis) direction of the sample is difficult to obtain. This paper describes our recent results on the dispersion of carbon black (CB) and particulate silica in natural rubber (NR) matrix observed by TEM combined with electron tomography (3D-TEM) technique, which enabled us to obtain images of 3D nano-structure of the sample. Thus, 3D images of CB and silica in NR matrix are visualized and analyzed in this communication. These results are precious ones for the design of soft nano-composites, and the technique will become an indispensable one in nanotechnology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.514-516.353.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Small angle x-ray scattering study on role of trapped entanglements in structure of swollen end-linked poly(dimethylsiloxane) networks (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 9105-9111 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Amorphous structure of swollen end-linked poly(dimethylsiloxane) (PDMS) network has been investigated by means of small angle x-ray scattering (SAXS) technique as a function of molecular mass of precursor PDMS (Mp) and junction (cross-link) functionality. The Mp dependence of the SAXS profiles for tetra-functional PDMS networks shows a striking crossover at around Mp(approximate)Mc where Mc represents the critical molecular mass to form entanglement couplings in the PDMS melt. These results strongly suggest that structure of swollen end-linked networks significantly depends on whether precursor chains are well entangled or not before end-linking, and that when precursor chain is long enough to form entanglement couplings, trapped entanglements formed in cross-linking (instead of cross-links) play a major role in elementary mesh of the resulting networks. For the networks of Mp(very-much-greater-than)Mc, the correlation length for the network structure is fairly small and comparable to that of dynamic density fluctuation for the solutions of the precursor polymer, and in addition, no appreciable effect of junction functionality on long-range network structure is observed. These observations imply that the contribution of cross-link to static heterogeneity in network structure is screened by trapped entanglement dominant in number. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481521
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  • 5
    Electronic Resource
    Electronic Resource
    Crossover of the concentration dependence of swelling and elastic properties for polysiloxane networks crosslinked in solution (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 3352-3359 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have investigated the preparation concentration dependence of the polymer volume fraction and the elastic modulus of the equilibrium swollen polydimethylsiloxane networks in toluene. The networks were prepared by the end-linking method in solution with a wide range of concentration. The network samples were attempted to be as small amount of structural defects as possible. The crossover has been observed for the preparation concentration dependence of the degree of equilibrium swelling and the elastic modulus. The crossover concentrations agree with each other, and are almost identical with the boundary concentration between the semidilute and the concentrated regime for the end-to-end distance of the polymer chain. The theoretical predictions which describe the experimental results have been derived as a function of the polymer volume fraction of preparation and swollen state, considering the effect of trapped entanglements on the elasticity and the concentration regime of preparation and swollen state. The good agreements of the theoretical predictions with the experimental results suggest that the trapped entanglements contribute to the elastic modulus together with the chemical crosslinks, and the crosslinking points moves affinely relative to the global polymer network on swelling. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471018
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  • 6
    Electronic Resource
    Electronic Resource
    Elastic modulus and equilibrium swelling of networks crosslinked by end-linking oligodimethylsiloxane at solution state (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 4833-4840 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have investigated the degree of equilibrium swelling and the elastic modulus of networks prepared by end-linking oligo(dimethylsiloxane)s (ODMS) in solution as a function of polymer concentration at crosslinking. The molecular weight of ODMS is so low that entanglement couplings are not formed in uncrosslinked state. It has been found from the preparation concentration dependence of elastic modulus in preparation state that trapped entanglements are formed by the introduction of crosslinks, and those considerably contribute to elastic modulus, even if the prepolymers are not entangled in uncrosslinked state. The experimental results for preparation concentration dependence of the degree of equilibrium swelling and the elastic modulus of equilibrium swollen networks are compared with the theoretical predictions by the two theories, i.e., the affine model and the c* theorem. It has been clearly shown that the affine model describes well the experimental results, while the discrepancies between the experimental results and the predictions by the c* theorem are considerable. These results strongly suggest that preparation concentration should be regarded as a reference state, and the displacement of crosslinks moves affinely on swelling, while the complete disinterpenetration of network chains in equilibrium swollen state, which is a postulate of the c* theorem, does not occur. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472320
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  • 7
    Electronic Resource
    Electronic Resource
    Activation of complement in human serum by polyurethane having PEO-PTMO-PEO as soft segment (1991)
    Springer
    Journal of materials science 2 (1991), S. 110-117 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Complement activation induced by segmented polyurethane and polyurethaneurea was studied. The polymers were synthesized from ABA-type triblock copolyether as a prepolymer, where A represents poly (ethylene oxide) (PEO) and B represents poly (tetramethylene oxide). The PEO contents in the triblock copolyethers were 0, 31 and 62 mol%. The whole complement in serum was activated via the classical and the alternative pathways. The contribution of the fourth complement component (i.e. the classical pathway) became larger with increasing PEO content in the polymers, due to the increased hydrophilicity of the polymer surface. The activation of the alternative pathway was affected by the concentration of NH groups and the degree of swelling of the polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703469
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  • 8
    Electronic Resource
    Electronic Resource
    Ionic conductivity and morphology of complexes formed by polyurethanes and lithium perchlorate (1990)
    Springer
    Polymer bulletin 23 (1990), S. 299-306 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Segmented polyether urethane (SEU) and urethaneurea (SEUU) were synthesized using ABA type triblock copolymer as a prepolymer, where A stands for poly(oxyethylene) and B stands for poly(oxytetramethylene). Lithium perchlorate was dissolved in SEU or SEUU to prepare LiC104 complexes (SEU/LiC104 and SEUU/LiC104) in film form. The highest conductivities observed here were 5.13x10-6 S cm-1 at 30°C and 3.34x10-5 S cm-1 at 50°C for LiC104/SEUU (oxyethylene-units content, 31 mol%). The ionic conductivity of these complexes was found to show the Arrhenius type temperature dependency. The effect of lithium perchlorate dissolution on the morphology of SEU and SEUU were also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032445
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  • 9
    Electronic Resource
    Electronic Resource
    Reaction of poly(epichlorohydrin) with sodium diethyldithiocarbamate and RI-UV dual-detector GPC of the product (1981)
    Springer
    Polymer bulletin 5 (1981), S. 463-468 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The chlorine in poly(epichlorohydrin) was found to be substituted by diethyldithiocarbamate (ETC) group by the reaction with NaETC in tetrahydrofuran at 60°C. The reaction product was analyzed by RI-UV dual-detector GPC. The composition i.e. the percentage of the chlorine replaced by the ETC group was found to be invariant with the elution count. This result might indicate the absence of polymer effect in the carbamation of poly(epichlorohydrin).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255984
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  • 10
    Electronic Resource
    Electronic Resource
    GPC analysis of polymer network formation 2. Bifunctional PPG prepolymer/crosslinker system (1997)
    Springer
    Polymer bulletin 38 (1997), S. 461-468 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Size distribution of polymer clusters in pre-gel state has been measured by means of gel permeation chromatography (GPC) for crosslinking system between bifunctional prepolymer and trifunctional crosslinker. Experimental chromatograms have been obtained at various degree of conversion, and compared with theoretical chromatograms predicted by the Flory-Stockmayer model. Experimental size distribution at low conversion is well described by the theory. On the other hand, experimental chromatograms at higher conversions show a long tail in lower elution volume region which is unexpected by the theory. This result suggests that clusters with relatively linear structure which is not predicted by the theory are formed. The formation of the clusters with fairly linear structure is estimated to originate from unequality in reactivity of sites in crosslinker which is due to steric hindrance by the reacted sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050074
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