Composition effects on ethylene/propylene copolymers studied by GPC-MALS and GPC-IR

Characterization of ethylene‐propylene copolymers with high‐temperature gradient adsorption liquid chromatography and CRYSTAF

“…Linear PE standards (Polymer Standard Service GmbH, Mainz, Germany), isotactic PP standards (American Polymer Standards, Mentor), linear PE with M w 260 kg/mol, iPP 200 kg/mol, and EP copolymers were dissolved in 1-decanol at a concentration of 1-2 mg/mL at 160 C. Samples of EP copolymers were prepared by Suarez 51,52 and described by Coto et al 53,54 The copolymerization reactions were carried out in a stirred tank reactor operating in semicontinuous mode at 70 C and 5 bar. Their molecular characterization data obtained with high-temperature SEC and NMR spectroscopy are summarized in Table I.…”

Polymer chain conformation of copolymers with different monomer size: 13C NMR spectroscopy and MALS study

“…In a previous work [22], obtained values for the q shape parameter range from 0.53 to 0.47 for EP1 and EP19, respectively, using the standard MALS method of calculation. Such slightly dependence with composition was even lower for the rest of studied copolymers.…”

Purification and structural characterization of an α-glucosidase inhibitory polysaccharide from apricot ( Armeniaca sibirica L. Lam.) pulp

“…The molecular weight and molecular weight distribution of the sample were measured using GPC/MALLS (Coto, Suárez, & Caballero, 2007;Liu, Bo, Zhang, & Zhu, 2003;Suárez, Caballero, & Coto, 2010). This process was performed on an infusion system (Waters 515 HPLC Unit Pump) fitted with one gel column (Shodex SB-806M) and the combined detectors (Wyatt-DAWN HELEOS ® eighteen-angle laser light scattering and Wyatt-Optilab rex refractive index detector).…”