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  • 1
    Electronic Resource
    Electronic Resource
    Novel Functional Polymers from N-(Tosyloxy)maleimide. Photochemical Acid Generation in Solid-State and Application as Resist Materials (1994)
    s.l. : American Chemical Society
    Chemistry of materials 6 (1994), S. 1452-1456 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00044a051
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of RGD-Grafted Porous PLLA Scaffold for Chondrogenic Differentiation of Stem Cells (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 297-300 
    Details
    ISSN: 1013-9826
    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: Biodegradable porous poly(L-lactic acid) (PLLA) scaffolds were prepared using gasfoaming method. The PLLA scaffolds with a hydrophobic surface were subjected to Ar plasmatreatment and in situ acrylic acid (AA) grafting to obtain hydrophilic PLLA scaffold (PLLA-PAA).Cell-adhesive RGD peptide was then immobilized onto the AA-grafted PLLA (PLLA-PAA-RGD).Once rabbit bone marrow-derived mesenchymal stem cells (BM-MSC) were isolated, MSCs wereseeded into PLLA control, PLLA-PAA, and PLLA-PAA-RGD scaffold and cultured for up to 4weeks in chondrogenic medium with the addition of 10 ng/ml transforming growth factor (TGF)-β1.Surface analysis of AA-grafted PLLA identified significant alterations of surface characteristics,including reduced contact angle and different atomic compositions. From WST-1 assay at 4 weeks,cells were found more proliferative in PLLA-PAA than the others. Upon the histological analysis ofSafranin O staining, chondrogenic differentiation of MSCs appeared to be progressed more activelyin PLLA-PAA. The effect of RGD immobilization on MSC differentiation was barely notable
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.297.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Thermosensitive and Cell-Adhesive Pluronic Hydrogels for Human Adipose-Derived Stem Cells (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 301-304 
    Details
    ISSN: 1013-9826
    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: Pluronic F127 has received increasing attention over many years as drug deliverysystems, biomaterials, and hydrogels for tissue engineering. In this study, we synthesizedtemperature-sensitive and cell-adhesive triblock F127 copolymers, in which Arg-Gly-Asp (RGD)peptide ligand was grafted to Pluronic F127-4-methacryloxyethyl trimellitic anhydride (4-META)to obtain F127-META-RGD. The chemical structures of the F127-META-RGD block copolymerswere confirmed by FTIR, 1H and 13C NMR, and GPC. The resultant F127-META-RGD showedvery similar thermosensitive behaviors to F127 and F127-META. The critical micelle temperature(CMT) of the F127 copolymers decreased in the order of F127 〈 F127-META 〈F127-META-RGD, whereas the particle size followed an opposite trend. Interactions between theF127 copolymers and adipose-derived stem cells (ASC) were evaluated in terms of cell adhesionand proliferation on the hydrogel. These thermosensitive RGD-grafted Pluronic hydrogels thatdisplay the enhanced cell adhesiveness, are expected to be useful as a functional injectable scaffoldfor tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.301.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Blood Compatibility of Novel Zwitterionic PEG-Grafted Nitinol Alloy for Peripheral Arterial Stents (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 805-808 
    Details
    ISSN: 1013-9826
    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: In this study, newly synthesized zwitterionic PEG was grafted on Nitinol alloy usingoxidation treatment. The surface property and blood compatibility of surface-modified Nitinolswere examined. The results of surface analysis showed that the contact angle and the ratio ofoxygen to carbon significantly decreased with Nitinol alloys. The total amount of fibrinogen (0.095μg/cm2) adsorbed onto TiNi-PEG2K-N+-S- was lower than that of TiNi control (0.12 μg/cm2). Theplatelet adhesion decreased in the order of TiNi control 〉 TiNi-MPEG2K 〉 TiNi-PEG2K-N+-S.Particularly, zwitterionic PEG with PEG2K was proven better than any others. The results indicatedthat zwitterionic PEG surface could significantly suppress platelet adhesion and protein adsorptionas compared to other samples. The present study suggested that grafted zwitterionic PEG structuremay possess improved blood compatibility
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.805.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    In Vitro Chondrocyte Culture Using Hydrophilized PLLA Scaffold in Bioreactor System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 253-256 
    Details
    ISSN: 1013-9826
    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: Nonporous PLLA film and porous PLLA scaffolds were prepared and then grafted withacrylic acid (AA) using in situ direct plasma treatment to obtain PLLA-g-PAA. Chondrocytesisolated from rabbit knee articular cartilages were cultivated in Dulbecco’s modified eagle medium-F12 (DMEM-F12) containing 10% fetal bovine serum (FBS) and 1% antibiotics and passaged twicebefore cell seeding. Once seeded on either PLLA films or scaffolds, they were placed in abioreactor system and an intermittent hydrodynamic pressure (IHP) was applied in 3 bars, whileturned on for 2 min and off for 28 min during 15-day culture. AA grafting to PLLA surface wasconfirmed from various surface analyses. From WST-1 assay, chondrocyte proliferation wassignificantly improved with dynamic IHP for PLLA and PLLA-g-PAA scaffolds as compared tostatic culture. This study indicates that IHP may have significant influence on chondrocytesbehavior in 3D culture environment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.253.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Photo-induced orientation and micropattern imaging of maleimide copolymers containing azobenzene side groups (1998)
    Springer
    Polymer bulletin 40 (1998), S. 1-8 
    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. Photo-induced birefringence properties of azobenzene containing maleimide copolymers P[DR1PMI-co-St]1 and P[DR1MSt-co-PMI]2 are investigated. These polymers show reversible photo-induced birefringence and the rate parameters for the induction and relaxation processes are obtained. Photoimage patterns of the polymers with narrowest line width of 2 µm are obtained. The micro patterns are relatively stable for over a month at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050215
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  • 7
    Electronic Resource
    Electronic Resource
    Fluorescent chemosensor for metal ions using a polymer having pendant pyridylbenzoxazole groups (2000)
    Springer
    Polymer bulletin 44 (2000), S. 79-84 
    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 A polymer having fluorescent pyridylbenzoxazole groups has been prepared for the purpose of detecting of metal ions. Metal ions such as Co2+, Ni2+, Cu2+ and Fe2+ were found to coordinate with the bipyridyl-like fluorescent benzoxazole chromophores. Among the metal ions investigated, the Fe2+ ion was shown to be the most effective in terms of its fluorescence quenching ability. The addition of a metal scavenger 2,2'-dipyridyl to the metal ion-quenched polymer solution resulted in the recovery of the fluorescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050576
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  • 8
    Electronic Resource
    Electronic Resource
    Polymerizations of substituted cyclopropanes. II. Anionic polymerization of 1,1-disubstituted 2-vinylcyclopropanes (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 3183-3191 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Among the four 1,1-disubstituted 2-vinylcyclopropanes, diethyl 2-vinylcyclopropane-1,1-dicarboxylate (Ia), 2-vinylcyclopropane-1,1-dicarbonitrile (Ib), ethyl 1-cyano-2-vinylcyclopropanecarboxylate (Ic), and 1,1-diphenyl-2-vinylcyclopropane (Id), Ib and Ic polymerized well with sodium cyanide in N,N-dimethylformamide. Ib was most reactive and a polymer (IIb) from Ib exhibited an inherent viscosity of 1.05 dl/g (concentration of 1.0 g in 100 ml of 95% H2SO4). All experimental results indicated that the polymerization proceeded by ring opening and that the structure of the polymers had pendant vinyl groups. The polymer IIc from Ic was soluble in common solvents like acetone, but IIb was soluble only in 95% H2SO4. Reactions of those compounds with benzenethiolate ion in ethanol yielded addition products that supported the ring-opening polymerization of those monomers. In the postulated mechanism of polymerization cyanide ion attacks the carbon of a cyclopropane ring with electron-releasing vinyl group and the resulting anion is thereby stabilized by two electron-withdrawing substituents. The propagation takes place by the reaction of the anion with another monomer molecule.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170171010
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and solution properties of poly(trans-5-ethylproline). A slow mutarotating substituted polyproline (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 1699-1715 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An optically active polypeptide, poly(trans-5-ethylproline) (PT5EP) was synthesized and its solution properties were observed to investigate the conformational changes with various conditions. The trans-5-ethyl substitution on polyproline showed noticeable perturbed effects on the conformations of the polypeptide as well as mutarotation of the polypeptide in solution. Circular dichroism (CD) spectra suggested that the polypeptide existed in a poly(L-proline) form-I-type helix and mutarotated slowly to an intermediate conformation in which some of the amide bonds had rotated to a trans conformation. In trifluoroethanol (TFE) solution the polymer took more than 20 days to change from a form-I-type helix conformation, in which CD bands for D-PT5EP are at 199.5 ± 1.0 (positive), 115.5 ± 0.5 (negative), and around 238 nm (positive), to an intermediate conformation. Upon addition of trifluoroacetic acid (TFA) to a TFE solution, the polymer was transformed to form-II-type polymers. Even a greater change in conformation was observed in a solution of TFA or in LiClO4-TFE. The overall change of the intensity ratio RCD of positive to negative CD bands of D-PT5EP was from 0.6-0.7 to 30. Reverse mutarotation toward the original form I was observed when n-butyl alcohol, water, or THF was added to a solution containing the form II polymer. A blue shift of the UV spectra and a change in the NMR spectrum also supported the concept of this conformational change.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210613
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  • 10
    Electronic Resource
    Electronic Resource
    Facile radical isomerization polymerization of vinyl disubstituted cyclopropanes (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 15 (1977), S. 751-753 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.130151208
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