Thermo-mechanical behavior and specific volume of highly crosslinked networks based on glycerol dimethacrylate and its derivatives

Abstract

Three substituent derivatives of glycerol dimethacrylate (GDMA) i.e., acetyloxypropyl dimethacrylate (Acet-GDMA), acryloyloxy-hydroxypropyl methacrylate (GMMA), and acetyloxy-acryloyloxypropyl methacrylate (Acet-GMMA) as well as GDMA were prepared and UVhomopolymerized in the presence of 2,2-dimethoxy-2-phenyloacetophenone. The obtained homopolymers were subjected to dynamic mechanical studies and the deflections versus temperature measurements (HDT) were performed. The content of unreacted double bonds, glass transition temperatures (T g ) as well as degree of inhomogeneity have been examined in all studied systems. Also, expansivity was measured in the function of temperature and the effect of a substituent group on the network properties was investigated. The results show that the hydroxyl-containing networks are characterized by much lower T g and higher degree of heterogeneity than those devoid of hydroxyls. When homopolymerized, hydroxylfree dimethacrylates disclosed untypical deflection pattern which suggests that at higher temperatures the decrease in stiffness is compensated or even overrated by the increase in the specific volume. Expansivity measurements revealed twice as large volume increase of the acetylated polymers as opposed to their hydroxyl-containing analogs. Following these findings, a mechanism of thermally induced polymer ''swelling'' was proposed.

Synthesis, characterization, and thermal properties of new flavor compounds

“…The esters of multifunctional monomers like acrylates and methacrylates of various types, functionality, length, flexibility of spacer groups, containing heteroatoms, cyclic, aliphatic, or aromatic rings are employed as new monomers for preparation of polymeric materials differ in properties [7][8][9][10][11][12][13][14][15][16]. They find their place in coatings for flooring and furniture, optical fibers, dental restorative materials, hard and soft contact lenses, photolithography, in biomedical applications as biomembranes, blood-compatible materials, antithrombotic, or antivital agents [30,31], to the production of porous microspheres in chromatography or as a potential component of polymer blends or composites [17][18][19][20][21][22].…”

High chemical and solvent resistant, branched terpene methacrylate polymers—Preparation, thermal properties, and decomposition mechanism

“…This reaction is catalyzed by the transient metal complexes, basic character compounds, and acidic character compounds . Moreover, hydroxymethacrylate monomers can be obtained by the addition reaction of glycidyl meth(acrylate) with compounds containing active hydrogen atoms such as carboxylic acids, amines, or phenols . In addition, meth(acrylate) monomers are often obtained by esterification of alcohols or phenols with meth(acryloyl) chloride in the presence of amine as a catalyst.…”

“…These allow obtaining thermo resistant and chemo resistant materials of various structure and with high mechanical strength . Applying monomers of various structure, eg, with long and flexible or short and rigid spacer chains between unsaturation, monomers with different functionality, monomers having cyclic or aromatic rings, aliphatic chains, or heteroatoms in their structure, pendant hydrophilic/hydrophobic groups, etc., there is a possibility to obtain polymers with a wide variety of properties . Such polymers due to their non‐toxicity and biocompatibility are used in the electronics, coatings, photolithography, microelectronics, in the production of contact lenses, dental restorative materials, optical fibres, polymeric microspheres, etc.…”

Application of dilatometry with modulated temperature for thermomechanical analysis of anti-wear coating/substrate systems

“…From the metrological perspective, the method developed is based on dynamic load thermomechanical analysis (DL TMA) principles while accepting that subjected to measurements of sample in the form of a physical substrate/PVD coating model corresponds to the sample of a material with viscoelastic properties. The possibilities of using the DL TMA for investigating thermomechanical properties of such systems are also described in [29][30][31][32]. The feature that makes the method developed distinct is that monitoring of internal stress changes in the coating is based on measurements of temperature and linear shifts of the substrate during annealing by developed curve.…”