Synthesis and Spectroscopic Analyses of New Polycarbonates Based on Bisphenol A-Free Components

Abstract

This paper discusses a new synthesis of bisphenol A-free polycarbonates based on four aliphatic-aromatic systems. In the first stage, different types of monomers (with/without sulfur) derived from diphenylmethane were synthesized. Then, new polycarbonates were prepared in the reactions with diphenyl carbonate (DPC) by transesterification and polycondensation reactions. Three different catalysts (zinc acetate, 4-(dimethylamino)pyridine and benzyltriethylammonium chloride) were tested. The structures of the compounds were confirmed by Nuclear Molecular Resonance spectroscopy (NMR) in each stage. The chemical structures of the obtained polycarbonates were verified by means of Attenuated Total Reflectance Fourier Transform infrared spectroscopy (ATR-FTIR). The presence of a carbonyl group in the infrared spectrum confirmed polycarbonate formation. Thermal studies by differential scanning calorimetry (DSC) were carried out to determine the melting temperatures of the monomers. A gel permeation chromatography analysis (GPC) of the polycarbonates was performed in order to investigate their molar masses. Thermal analysis proved the purity of the obtained monomers; the curves showed a characteristic signal of melting. The obtained polycarbonates were characterized as having high resistance to organic solvents, including tetrahydrofuran. The GPC analysis proved their relatively large molar masses and their low dispersity.

Synthesis and Characterization of New Polycarbonate-Based Poly(thiourethane-urethane)s

“…Dithiol (T m = 85 °C) was obtained at the Department of Polymer Chemistry, Maria Curie-Skłodowska University [ 33 , 61 ]. HMDI ( Desmodur W ® ) and PCD of = 2000 g/mol ( Desmphen ® C2200 ) were kindly supplied by Covestro (Leverkusen, Germany).…”

New Segmented Poly(Thiourethane-Urethane)s Based on Poly(ε-Caprolactone)Diol Soft Segment: Synthesis and Characterization

“…Dithiol ( T m = 85 °C after recrystallization from ethanol) was obtained from bis (chloromethyl)-compound through the thiouronic salt [ 19 , 26 ]. HMDI ( Desmodur W ® ) was kindly supplied by Covestro (Leverkusen, Germany).…”

Special Issue: Synthesis, Processing, Structure and Properties of Polymer Materials

“…In this Special Issue, 33 original articles have been published on various topics, including the preparation, characterization, and some examples of application of polymeric materials. This issue includes review articles [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ] and research articles [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

“…The scope of research articles of papers included a Special Issue is very wide. It includes papers on the synthesis and study of the properties of new thermoplastic polymers [ 9 , 10 , 11 , 12 , 13 ], obtaining of composites [ 14 , 15 , 16 ], nanocomposites [ 17 , 18 , 19 ], microspheres [ 20 , 21 ], polymeric blends [ 22 , 23 , 24 ], hydrophobic nanostructures [ 25 ], polymeric membranes [ 26 , 27 ], hydrogels [ 28 ] and others [ 29 , 30 , 31 , 32 , 33 ].…”

“…In another paper, Wnuczek et al [ 10 ] proposed the synthesis of novel polycarbonates obtained without the use of toxic bisphenol A.…”