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Synthesis and Characterization of Interpenetrating Polymer Networks (IPNs) from Acrylated Soybean Oil α-Resorcylic Acid: Part 2. Thermo-Mechanical Properties and Linear Fracture Mechanics

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The thermo-mechanical properties and linear fracture mechanics of acrylated soybean oil and the triglycidylated ether of α-resorcylic acid interpenetrated networks as a function of their weight composition are the focus of Part 2 of this article. Thermo-mechanical characterization showed that the obtained materials behave as thermoset amorphous polymers, and that both the modulus and glass transition are extremely dependent on the epoxy/acrylate weight ratio. Modulus values ranged from 0.7 to 3.3 GPa at 30 °C, and glass transition temperatures ranged from around 58 °C to approx. 130 °C. No synergistic effect on these two properties was observed. Interpenetrating networks containing equivalent weight proportions of the parent resins showed the highest fracture toughness of the series, exhibiting a KIc value of around 2.1 MPa·m1/2. The results showed that the KIc values did not increase as Mc increased, which seems to suggest that a different mechanism is responsible for the increase in the fracture toughness displayed by IPNs. Also, there seems to be an exponential-type increase in the fracture energy with the M1/2 c for the materials containing the epoxy phase.
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Keywords: FRACTURE TOUGHNESS; IPNS; MECHANICAL PROPERTIES; PHENOLIC ACIDS; VEGETABLE OILS

Document Type: Research Article

Publication date: 13 July 2017

This article was made available online on 16 March 2017 as a Fast Track article with title: "Synthesis and Characterization of Interpenetrating Polymer Networks (IPNs) from Acrylated Soybean Oil a-Resorcylic Acid: Part 2. Thermo-Mechanical Properties and Linear Fracture Mechanics".

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