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Search: authors:"Gabriel Rokicki"

6 papers found.
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Copolymers dispersions designed to shaping of ceramic materials

The paper concerns the synthesis and the characterization of new water-thinnable binder such as poly(acrylic–styrene) with the addition of a new amphiphilic macromonomer and it application in shaping of unmodified and modified (by silanization) Al2O3 by die pressing. The organic additives decomposed thermally to non-toxic gases which is beneficial from ecological point of view...

Assessment of aliphatic poly(ester-carbonate-urea-urethane)s potential as materials for biomedical application

Selected mechanical and biological properties of biodegradable elastomeric poly(ester-carbonate-urea-urethane)s (PECUUs) point towards their potential to be applied as scaffolds in tissue engineering. Here we explore their medical applicability taking into account their hemocompatibility and cytotoxicity. The influence of the ester monomer (derivatives of adipic and succinic...

Poly(urethane-urea)s Based on Oligocarbonatediols Comprising Bis(carbamate)alkanes

In this work the results of studies on the prepolymeric method of obtaining poly(urethane-urea)s from oligocarbonatediols and isophoronediisocyanate (IPDI), cured with water vapor, are presented. α,ω-Bis(2-hydroxyethoxycarbonylamino)alkanes (dihydroxydiurethanes, DHDU) incorporated into the structure of oligocarbonatediols and as pseudo-chain extenders were used for the synthesis...

Synthesis of Six-Membered Cyclic Carbonate Monomers by Disproportionation of 1,3-Bis(alkoxycarbonyloxy)propanes and Their Polymerization

A new synthetic method of six-membered cyclic carbonates is presented. Different 1,3-bis(alkoxycarbonyloxy)propanes obtained from 1,3-diols and diethyl or dimethyl carbonate were subjected to disproportionation at 200—350°C in the presence of colloidal silica or Sn(II) stearate leading to 1,3-dioxan-2-ones. The disproportionation was carried out in gaseous and liquid phases. The...

Poly(ether-carbonate)s from Diphenolates, Cyclic Carbonates, and Dihalo Compounds

Reactions of dipotassium diphenolates with cyclic carbonates and α,ω-dihalo compounds in the presence of 18-crown-6 ether were studied. Poly(ether-carbonate)s with various contents of carbonate linkage or polyethers were formed in these reactions depending on the kind of diphenolate and dihalo compound and the reaction temperature. The mechanism of carbonate linkage formation...

A New Route to Carbonate Monomers for Synthesis of Polycarbonates

A number of carbonates (RCH2)2CO3 (R=CH3, C2H5, CH2=CH, C3H7, C5H11, C6H5) have been synthesized by the reaction of alkali metal carbonates with corresponding halogen derivatives in the presence of activating agents such as crown ethers, polyglymes, polyamines, and triethylbenzylammonium chloride. The effects of various parameters (type of the halogen derivative, metal carbonate...