Abstract
Synthesis and Characterization of Interpenetrating Polymer Networks (IPNs) from Acrylated Soybean Oil α-Resorcylic Acid: Part 2. Thermo-Mechanical Properties and Linear Fracture Mechanics
Highlights
An interpenetrated polymer network (IPN) is an intimate combination of two or more polymers, where at least one of them is crosslinked in the presence of a network of the other [1]
No synergistic effect on the thermo-mechanical properties was observed, and contrary to this a reduction in the mechanical performance was observed in the IPN when compared to their parent resins, mainly attributable to the plasticizer effect conferred by the triglyceride-based acrylate matrix
The results showed that the KIc values did not increase as molecular weight between crosslinks (Mc) increased, which seems to suggest that a different mechanism is responsible for the increase in the fracture toughness displayed by
Summary
An interpenetrated polymer network (IPN) is an intimate combination of two or more polymers, where at least one of them is crosslinked in the presence of a network of the other [1]. It is generally known that the vast majority of IPNs do not interpenetrate at the molecular level, but rather form different phases finely divided at the nanometer scale These kinds of multicomponent polymeric systems represent an excellent approach for combining the properties of different polymeric materials in a synergetic way. It was clear that each constituent is affected by the presence of the other, altering the rate and extent at which each individual reaction takes place; and that the two non-competing reactions (step and free radical polymerizations) occurred at very close temperatures, with a very small gap of around 10 °C between the onsets of the reactions This evidence leads to the conclusion that the IPNs are formed by a simultaneous process, in which both of the networks are synthetized at the same time. The evaluation of the thermomechanical properties and the study of the networks by means of the rubber elasticity theory allows determining if the properties are either varying as a function of the composition, or exhibit a maximum in the properties as a function of the crosslinking density or molecular weight between crosslinks
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