For the first time polyolefins are separated according to tacticity by liquid chromatography. High-temperature gradient HPLC is shown be suitable for separation of polyethylene and polypropylene. As stationary phase a porous carbon-based material used; mobile composed 1-decanol 1,2,4-trichlorobenzene. It that at an operating temperature 160 °C linear as well syndiotactic atactic polypropylenes fully adsorbed on from 1-decanol. In contrast, isotactic polypropylene eluted. This behavior...

A new multidimensional fractionation technique, temperature rising elution (TREF) combined with high size exclusion chromatography FTIR (HT-SEC-FTIR), HT-SEC-DSC and two-dimensional liquid (HT-2D-LC) is used for the comprehensive analysis of a commercial impact polypropylene copolymer. HT-SEC-FTIR provides information regarding chemical composition crystallinity as function molar mass. Thermal selected SEC fractions yields melting crystallization behavior these which related to heterogeneity...

Comprehensive two-dimensional liquid chromatography (LC × LC) and ion mobility spectrometry–mass spectrometry (IMS–MS) are increasingly being used to address challenges associated with the analysis of highly complex samples. In this work, we evaluate potential combination these techniques in form a comprehensive three-dimensional LC IMS separation system. As application, hydrophilic interaction (HILIC) reversed phase (RP-LC) IMS–high-resolution MS (HR-MS) was analyze range phenolic...

Poly(propylene oxide)s can be analyzed efficiently with respect to functionality and molar mass by coupled liquid chromatography MALDI-TOF spectrometry. Both techniques are via a robotic interface, where the matrix is coaxially added eluate spotted dropwise onto MALDI target. It shown that size exclusion at critical conditions of adsorption yield useful structural information on oligomer masses chemical composition. In particular, analysis technical poly(propylene oxide) triols...

Abstract Polyflavonoid tannin–formaldehyde–furfuryl alcohol rigid foams yield hardened, rigid, tridimensional networks in which there are covalently linked structures derived from the reaction of their main components. Thus, polyflavonoid tannin structures, tannin–formaldehyde furanic by self‐condensation furfuryl alcohol, and mixed tannin–furane tannin–furane–formaldehyde all present continuous foam networks. Some complex, involving tannin's flavonoid units, furan nuclei,...

Mixed interior wood panel tannin adhesive formulations were developed in which lignin was considerable proportion, 50%, of the binder, and no 'fortification' with synthetic resins, such as isocyanates or phenol-formaldehyde resins used past, necessary to obtain results satisfying relevant standards. A low molecular mass obtained industrially by formic acid/acetic acid pulping wheat straw used. Environment-friendly, non-toxic polymeric materials natural origin constitute up 94% total binder....

The free-radical dispersion polymerization of methyl acrylate (MA) in isododecane was carried out the presence a poly(2-ethylhexyl acrylate) macromolecular RAFT (reversible addition-fragmentation chain transfer) agent bearing trithiocarbonate reactive group middle (P2EHA-TTC). function crucial for synthesis monodisperse colloidal poly(methyl (PMA) particles stabilized by P2EHA segments. hydrodynamic diameters ranged from 100 to 300 nm, using particularly low amounts macro(RAFT agent) (1-6 wt...

Abstract The structures of six commercial hydrolyzable tannins, chestnut, oak, tara, sumach, chinese gall, and turkey gall tannins have been examined by matrix‐assisted laser desorption/ionization‐time‐of‐flight (MALDI‐TOF) mass spectrometry. Their oligomeric structure distributions defined. Degradation products rather different than what previously reported were present. Different galloyl glucose monomers observed for chestnut oak tannin extracts in gallotannin extract. Combination...

For the first time, complex composition of a two-reactor-produced impact polypropylene copolymer (IPC) has been fully revealed by advanced thermal analysis, using combination fast scanning DSC (HPer DSC, flash and solution DSC) with SEC fractionation subsequent to TREF fractionation. The dual TREF-SEC separation provided fractions few micro- or nanograms that were used correlate molecular structure polymer chains their properties (melting crystallization behavior different macromolecules...

Abstract Kraft (LN-T-CO2-2) and wheat straw (CIMV) glyoxalated lignin mixed with mimosa tannin hexamine as a hardener were used wood adhesive resins in particleboard fabrication. The systems proportion 40/60 50/50 w/w for tannin, respectively. gel time test was determined by knowing the polymerization between different mixes under controlled conditions. results showed slower kraft lignin/mimosa blending than one. Thermomechanical analyses (TMA) tests carried out an indication of final...

Abstract High molar mass wood tannin extracts are complex mixtures that distributed in both and chemical composition. Hydrolysable tannins from tara, Turkey gall, chestnut woods were analyzed compared using matrix‐assisted laser desorption/ionization time‐of‐flight (MALDI‐TOF) spectrometry. Although MALDI‐TOF MS reveals the oligomer structure of tannins, this method cannot distinguish between isomers with isobaric masses and, therefore, ambiguous structural assignments made a number cases....