TY - JOUR A1 - Eckert, Alexander A1 - Abbasi, Mozhdeh A1 - Mang, Thomas A1 - Saalwächter, Kay A1 - Walther, Andreas T1 - Structure, Mechanical Properties, and Dynamics of Polyethylenoxide/Nanoclay Nacre-Mimetic Nanocomposites JF - Macromolecules N2 - Nacre-mimetic nanocomposites based on high fractions of synthetic high-aspect-ratio nanoclays in combination with polymers are continuously pushing boundaries for advanced material properties, such as high barrier against oxygen, extraordinary mechanical behavior, fire shielding, and glass-like transparency. Additionally, they provide interesting model systems to study polymers under nanoconfinement due to the well-defined layered nanocomposite arrangement. Although the general behavior in terms of forming such layered nanocomposite materials using evaporative self-assembly and controlling the nanoclay gallery spacing by the nanoclay/polymer ratio is understood, some combinations of polymer matrices and nanoclay reinforcement do not comply with the established models. Here, we demonstrate a thorough characterization and analysis of such an unusual polymer/nanoclay pair that falls outside of the general behavior. Poly(ethylene oxide) (PEO) and sodium fluorohectorite form nacre-mimetic, lamellar nanocomposites that are completely transparent and show high mechanical stiffness and high gas barrier, but there is only limited expansion of the nanoclay gallery spacing when adding increasing amounts of polymer. This behavior is maintained for molecular weights of PEO varied over four orders of magnitude and can be traced back to depletion forces. By careful investigation via X-ray diffraction and proton low-resolution solid-state NMR, we are able to quantify the amount of mobile and immobilized polymer species in between the nanoclay galleries and around proposed tactoid stacks embedded in a PEO matrix. We further elucidate the unusual confined polymer dynamics, indicating a relevant role of specific surface interactions. Y1 - 2020 U6 - https://doi.org/10.1021/acs.macromol.9b01931 SN - 1520-5835 VL - 53 IS - 5 SP - 1716 EP - 1725 PB - ACS Publications CY - Washington, DC ER - TY - JOUR A1 - Heinze, Daniel A1 - Mang, Thomas A1 - Peter, Karin A1 - Möller, Martin A1 - Weichold, Oliver T1 - Synthesis of low molecular weight poly(vinyl acetate) and its application as plasticizer JF - Journal of applied polymer science N2 - Poly(vinyl acetate), PVAc, with a degree of polymerization Xn = 10 was prepared by chain-transfer radical polymerization using carbon tetrachloride and used as oligomeric plasticizer for commercial PVAc. However, the chlorinated chain ends cause a low thermal stability requiring mild Cl/H substitution. The product exhibits high thermal stability and excellent melt-compounding properties. Blends of oligomeric and commercial PVAc show single glass transition temperatures which decrease with higher oligomer content and exhibit small negative deviations from Fox' linear additivity rule. This indicates plasticization and miscibility being mainly due to entropic effects. Injection-moulded thick specimens show ductile behaviour at oligomer contents >10 wt %, while sheets with a thickness of 0.2–0.5 mm appear flexible already at 7.5 wt %. The oxygen permeability coefficients are an order of magnitude lower than those of low-density polyethylene. Due to the sum of their properties, the plasticized sheets present a promising alternative in the preparation of barrier materials. Y1 - 2014 U6 - https://doi.org/10.1002/app.40226 SN - 1097-4628 (E-Journal); 0021-8995 (Print) VL - 131 IS - 9 SP - Article No. 40226 PB - Wiley CY - New York ER - TY - JOUR A1 - Mang, Thomas T1 - Thermosensitive Magnetic Nanoparticles for Bioanalytical and Therapeutical Applications JF - Biomedizinische Technik = Biomedical Engineering. 49 (2004), H. 2 Y1 - 2004 SN - 0013-5585 SP - 1006 EP - 1007 ER - TY - JOUR A1 - Mang, Thomas A1 - Haulena, Friedhelm A1 - Rose, Gerd T1 - Trennung und werkstoffliche Verwertung von Aluminium-Kunststoff-Verbundmaterial JF - Aluminium. 70 (1994), H. 5/6 Y1 - 1994 SN - 0002-6689 SP - 333 EP - 339 ER - TY - JOUR A1 - Mang, Thomas A1 - Haulena, Friedhelm T1 - Veranstaltung des 15. Kolloquiums Chemie und Technologie makromolekularer Stoffe: wässrige Kunststoffdispersionen, FH Aachen (1994) JF - Farbe und Lack. 101 (1995), H. 1 Y1 - 1995 SN - 0014-7699 SP - 72 EP - 72 ER - TY - BOOK A1 - Gartzen, Johannes A1 - Heil, Günter A1 - Mang, Thomas T1 - Verfahren und Vorrichtung zur Isolierung von polymeren Werkstoffen und Metallen aus Verbundwerkstoffen / Offenlegungsschrift DE 4037523 A1 ; Offenlegungstag 27.05.1992 Y1 - 1992 N1 - DE4037523A1 27.05.1992 ; Veröffentlichungstag im Patentblatt 27.05.1992 ; Volltext recherchierbar über PB - Deutsches Patentamt CY - München ER - TY - BOOK A1 - Gartzen, Johannes A1 - Heil, Günter A1 - Mang, Thomas T1 - Verfahren zum Behandeln von miteinander mittels Haftvermittler verbundene Materialien / Offenlegungsschrift DE 4127705 A1 ; Offenlegungstag 25.02.1993 / Anmelder: Schering AG Y1 - 1993 N1 - DE 4127705 A1 ; Veröffentlichungstag im Patentblatt 25.02.1993 ; Volltext recherchierbar über PB - Deutsches Patentamt CY - München ER - TY - BOOK A1 - Mang, Thomas T1 - Verfahren zum Trennen eines Kunststoffes von einem Trägermaterial / Offenlegungsschrift DE 4313007 A1 ; Offenlegungstag 27.10.1994/ Anmelder und Erfinder : Mang, Thomas Y1 - 1994 N1 - DE 4313007 A1 ; Veröffentlichungstag im Patentblatt 27.10.1994 ; Volltext recherchierbar über PB - Deutsches Patentamt CY - München ER - TY - BOOK A1 - Gartzen, Johannes A1 - Heil, Günter A1 - Mang, Thomas T1 - Verfahren zur Aufbereitung eines Gemisches aus Zellulose und granuliertem Polymer / Patentschrift DE 4133699 C2 Y1 - 1998 N1 - DE 4133699 C2 ; Veröffentlichungstag der Patenterteilung 19.02.1998 ; Volltext recherchierbar über PB - Deutsches Patentamt CY - München ER - TY - BOOK A1 - Mang, Thomas A1 - Heil, Günter A1 - Gartzen, Johannes T1 - Verfahren zur Behandlung von Fotopapier / Patentschrift DE 4105368 C1 Y1 - 1992 N1 - DE 4105368 C1 ; Veröffentlichungstag der Patenterteilung 07.05.1992 ; Volltext recherchierbar über PB - Deutsches Patentamt CY - München ER -