Two series of thermoplastic elastomers with various chemical compositions of ester block were prepared via the reaction of α,ω-dicarboxylic oligo(laurolactam) (PA12, Mw≈2000 g/mol) with oligo(oxytetramethylene)diol (PTMO, Mw≈1000 g/mol) or linoleic alcohol dimer (DLAol) and with dimethyl terephthalate and a low molecular weight glycol (forming during the synthesis of the ester block). The degree of polycondensation (DPGT) of poly(multi-methylene terephtalate) equals to DPGT=2. The influence of the number of carbons separating the terephtalate groups, as well as the effect of meta- or para- positions of the ester groups in the benzene ring of other blocks, on the synthesis, properties and structure of these elastomers have been evaluated. A nuclear magnetic resonance spectroscopy to carbon (13C NMR) and Fourier transform infrared spectroscopy (FT-IR) were used to confirm their assumed chemical structure. The influence of chemical compositions of ester block on the functional properties and on the values of phase transition temperatures of the products have been determined. The thermal properties and the phase separation of obtained systems were defined by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), wide-angle x-ray diffraction (WAXS) and other standard physical methods. The mechanical and elastic properties of obtained polymers were evaluated.
Part of the book: Thermoplastic Elastomers