Abstract In present work structural properties and aging of thermoplastic starches prepared by plasticization cornstarch with urea, glycerol their mixtures are studied using solid‐state 1 H NMR 13 C spectroscopy WAXS measurements. Broad line spectra reveal phase separation plasticizers during the samples same or higher relative amount than urea. Glycerol in TPS induces motion starch chain segments, mobility which depends on glycerol. At scale nm, formation B‐type crystallites containing also...

A stimuli-responsive drug delivery system consisting of SBA-12 nanoporous silica modified with a photo-switchable coumarin ligand was studied for the non-steroidal anti-inflammatory naproxen.

Determination of a true temperature and gradient in the solid-state NMR sample is serious problem MAS measurements which use variable-temperature control unit (VT NMR).In presented article method takes advantage dependence 207 Pb chemical shift Pb(NO 3 ) 2 proposed for solution this problem.Dependences on rate at room are reported as well measured processed dependences centre edges rotor set (VT) characteristic (frequently used) rates 10 kHz 6kHz, respectively.Analysis spectra provided...

Crumb rubber (CR) can be used for binder modification or aggregate replacement in asphalt mixtures road construction, when it is usually referred to as CR modifier (CRM). CRM elastic properties depend on the quality of parent material and storage conditions final material. They deteriorate time due degradation processes among other things they influence swelling capacity during preparation. The presented paper demonstrates sensitivity basic nuclear magnetic resonance (NMR) parameters (proton...

ABSTRACT MAS 13 C‐NMR measurements were used for the study of morphology and molecular mobility in amorphous quenched triacetine‐plasticized PLA samples which underwent cold crystallization during annealing at 80 100 °C. The single pulse spectra indicate that plasticizer promotes results decrease temperature formation more perfect crystalline domains. T 1 ( C) spin‐lattice relaxation times show presence molecules leads to an increase local chains but plasticized after °C shows rigid...

The high-resolution solid-state 13 C NMR spectra were recorded for metallocene (m) and Ziegler-Natta (ZN) isotactic polypropylenes (iPP) in pelletized form using cross polarization (CP) magic angle spinning (MAS) techniques within the temperature range of 20-160°C.Besides CP MAS experiments also (without CP), 1 H rotating frame spin-lattice relaxation times T 1" ( C) measured at elevated temperatures.With rise splitting CH 2 , 3 signals into two components was detected assigned to amorphous...

Poly(3-hydroxybutyrate) (PHB) is a semicrystalline biodegradable polymer with chains consisting of methyl (CH3), methylene (CH2), methine (CH) and carbonyl (CO) groups.The 1 H-13 C cross polarization NMR measurements were performed on an as-supplied powder PHB sample at magic-angle spinning rate 10 kHz.The measured build-up curves their analysis provided information the dynamics in functional groups directly bonded hydrogens.The required setting up Hartmann-Hahn condition, which was inferred...

Abstract The structurally unique clay–intercalable (9,10‐dihydroxyoctadecyl)trimethylammonium (OH‐ODTMA) cationic surfactant was synthesized in two steps from commercially available oleylamine. Sodium montmorillonite modified by a cation‐exchange reaction using three different octadecyltrimethylamonium ODTMA‐based organic cations. Basal spacings, configuration, the interlamellar structure, and thermal stability of resulting organomontmorillonites were characterized X‐ray diffraction, IR...

Single-pulse 13C NMR spectra and spin-lattice relaxation times T1(1H), detected indirectly via carbons, T1(13C) were measured at 31°C for virgin pelletized annealed polylactic acid (PLA) samples using the magic-angle spinning technique. The structural resulting in more regular crystals with narrower conformation distribution increase lamellae thickness crystallinity brought about by annealing 100°C was deduced from narrowing of lines proton T1(1H). related to respective carbons α-polymorph...

Structural changes in polyhydroxybutyrate (PHB) brought about by addition of chain extender and/or plasticizer were studied using 13 C MAS NMR spectra, which measured the direct polarization technique at 30 and 98 • C. Four resonances associated with CO, CH, CH2 CH3 groups PHB observed spectra.The resonance appearing shows splitting into two lines related to crystalline amorphous regions.Analysis made it possible estimate inuence applied modications on crystallinity distribution...

The paper deals with a method for the estimation of degree crystallinity partially-crystalline isotacticpolypropylenes (i-PP) using high-resolution solid-state 13 C NMR.For this purpose direct polarization MAS NMR spectra were measured i-PP samples dierent degrees at 98 • C. areas beneath resonance lines in these correspond to number carbons particular functional groups, while widths and shapes reect crystallinity, crystalline modications, distribution chain conformations mobility.The...

The undoped, and Er-doped yttrium aluminozirconate (AYZ) glasses were prepared by ame synthesis in the form of transparent glass microbeads.The ZrO2 content was range between 5 20 mol.%.The microbeads characterised optical microscopy, SEM, XRD, DSC, 27 Al MAS NMR, UV VISNIR uorescence spectroscopy.The thermal stability AYZ glasses, expressed terms dierence transition temperature, Tg, onset crystallization, Tx, not aected increasing content.The NMR spectra studied samples reveal that atoms...