Renewable Semi-Interpenetrating Polymer Networks Based on Vegetable Oils Used as Plasticized Systems of Poly(3-hydroxyalkanoate)s

Abstract

Biobased semi-interpenetrating polymer networks (semi-IPNs) in which poly­(3-hydroxybutyrate-co-3-hydroxyvalerate)­s, PHBHV, are embedded in a tridimensional network were developed to improve the mechanical properties of polyesters. Semi-IPNs are obtained by cross-linking sunflower oil (SO) and trimethylolpropane tris­(3-mercaptopropionate) (TriSH) using a photoactivated thiol–ene reaction in the presence of 2,2′-dimethoxy-2-phenyl acetophenone. The SO-TriSH contents in the network varied from 20 to 45% wt. Homogeneous semi-IPNs containing from 20 to 40% of SO-TriSH content exhibited lower glass temperature from 4 to −15 °C, higher strain at break values from 7 to 150%, and better thermal stability than those of pristine PHBHV. This reveals an improvement of the deformability of PHBHV due to the plasticization domains by the SO-TriSH domains. The fact that a fraction of the interpenetrating networks follows Fox equation, which is usually verified by well-mixed plasticizer/polymer systems, could be a positive signature of an interpenetrating effect between reticulated SO-TriSH and PHBHV chains. Those properties were achieved without degrading the intrinsic crystalline structure of PHBHV as demonstrated by WAXS measurements.

Fully bio‐based thiol‐ene photocured thermosets from isosorbide and tung oil

“…However, it is known that the double bonds of oils exhibit low reactivity due to steric hindrance . Nevertheless, semi‐interpenetrating polymer networks were prepared from poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate), sunflower oil, and trimethylolpropane tris(3‐mercaptopropionate) via TE photopolymerization . Three‐dimensional networks were prepared via TE photopolymerization in other works with slight modifications.…”

Co-Networks Poly(hydroxyalkanoates)-Terpenes to Enhance Antibacterial Properties

“…It can be noticed that Ts values remain close to each other. It is important to note that this value is higher than native PHBHV (Ts = 126 • C [52]). This result is a consequence of the crosslinking, which induces the higher thermal stability of the PHBHV-L materials.…”

Improving Oxygen Permeability and Thermostability of Polycarbonate via Copolymerization Modification with Bio-Phenol Polysiloxane

“…Derived from natural products, eugenol (4-allyl-2-methoxyphenol) is one kind of bio-phenol, which is a primary constituent of plant essential oil, such as clove oil, laurel oil, and camphor oil and characterized by the presence of functional groups, such as the hydroxy, methoxy and allyl groups. Eugenol has been used in compound modification for its antibacterial activity, thermal stability, and chemical reactivity [1,2,3,4,5]. With the reactive phenol hydroxyl, bio-phenol polysiloxane has been synthesized via facile heterogeneous catalytic route between eugenol and hydrogen terminated polysiloxane [6,7,8].…”