Biobased Acrylate Shells for Microcapsules Used in Self-Healing of Cementitious Materials

Abstract

To facilitate the ongoing transition towards carbon neutrality, the use of renewable materials for additive manufacturing has become increasingly important. Here, we report for the first time the fabrication of microcapsules from biobased acrylate shells using microfluidics. To select the shell, a wide range of biobased acrylates disclosed in the literature was considered according to their tensile strength, ductile transition temperature and global availability. Once acrylate epoxidised soybean oil (AESO) was selected, its viscosity was adjusted to valuables suitable for the microfluidic device using two different diluting agents. Double emulsions were successfully produced using microfluidics, followed by photopolymerisation of the shell and characterisation of the capsules. Microcapsules containing AESO and isobornyl acrylate (IBOA) were produced with an outer diameter ~490 μm, shell thickness ranging between 36 and 67 μm, and production rates around 2.4 g/h. The mechanical properties of the shell were characterised as tensile strength of 29.2 ± 7.7 MPa, Young’s modulus of 1.7 ± 0.4 GPa and the ductile transition temperature was estimated as 42 °C. To investigate physical triggering, microcapsules produced with a size of 481 ± 4 μm and with a measured shell thickness around 6 μm were embedded in the cementitious matrix. The triggered shells were observed with scanning electron microscopy (SEM) and the uniform distribution of the capsules in cement paste was confirmed using X-ray computed tomography (XCT). These advances can facilitate the wide application of biobased resins for the fabrication of microcapsules for self-healing in cementitious materials.

Shaping, Degradation And Drug Release Of Biosourced Particles Made From Acrylated Vegetable Oils

“…However, the majority of research on AESO-based polymers has predominantly focused on additives for composites or bulk materials, primarily due to their inherent poor mechanical properties [14] . Notably, examples on the preparation and application of polymerized AESO particles are very scarce [20] . This paper aims to fill this gap by presenting a straightforward approach to fabricate pAESO particles.…”

One-Pot Synthesis of Biobased Acrylic Microcapsules for Controlled Release of Fragrance in Consumers Products

“…20,21 Microcapsules were also synthesized using acrylates bearing, e.g., soybean oil-derived side chains, where the resultant polymers contained a fossil-based polyacrylate backbone and biobased side chains and were partially biobased overall. 22 In this work, we synthesized poly(meth)acrylate microcapsules using partially biobased methacrylate monomers and fully biobased itaconate monomers for increasing biomass contents. We referred to a literature work for successfully synthesizing a microcapsule using fully fossil-based monomers, i.e., methyl methacrylate (MMA) as a hydrophobic monomer, methacrylic acid (MAA) as a hydrophilic monomer, and a mixture of pentaerythritol triacrylate (PETIA) and pentaerythritol tetraacrylate (PETRA) as cross-linkable monomers.…”

“…As such, partially biobased polyureas were synthesized using chitosan oligomers and isocyanate to form biobased microcapsules. , Microcapsules were also synthesized using acrylates bearing, e.g., soybean oil-derived side chains, where the resultant polymers contained a fossil-based polyacrylate backbone and biobased side chains and were partially biobased overall …”