Preparation of monosultap‐polyurethane microcapsules in an inverse emulsion through interfacial polymerization

Abstract

In this study, we prepared monosultap microcapsules in an inverse emulsion through interfacial polymerization for the first time. The microcapsules are spherical pellets with intact and smooth shell and have a narrow particle size distribution with an average size of about 2.35 μm. More importantly, our microcapsules have excellent thermal stability with a starting decomposition temperature of 233.1 C, high encapsulation efficiency of 81.9% as well as long-term slow release of monosultap under different conditions. In addition, the shell of the microcapsules can degrade completely in the natural condition, avoiding the pollution to the environment. It can be believed that our microcapsules will show good service performance if employed in agricultural industry.

Microcapsules composed of stearic acid core and polyethylene glycol‐based shell as a microcapsule phase change material

“…Interfacial polymerization is an effective method to fabricate microcapsules enwrapping oil-soluble core materials in oil-in-water emulsions. 35,36,38,39 In this article, the morphology of the microcapsules composed of SA core and the PEG-based shell was detected by a SEM, which is shown in Figure 2A. As demonstrated in Figure 2A, the microcapsules are all spheres, which avoid the leakage of SA even if the environment temperature is higher than the phase transition temperature.…”

“…Interfacial polymerization is an effective method to fabricate microcapsules enwrapping oil‐soluble core materials in oil‐in‐water emulsions 35,36 , 38,39 . In this article, the morphology of the microcapsules composed of SA core and the PEG‐based shell was detected by a SEM, which is shown in Figure 2A.…”

Preparation and performance of chlorfenapyr microcapsules with a degradable polylactide-based polyurethane wall material

“…The encapsulation efficiency (EE)% of the microcapsules was calculated by eqn (3). 26 The chlorfenapyr concentration in the solution was determined using a LC-20A high-performance liquid chromatograph (HPLC, Shimadzu, Japan) with a UV detector, three parallel experiments were conducted for each of the microcapsule samples. The test conditions were methanol/water (92/8, v/v) as a mobile phase with a ow rate of 1 mL min À1 .…”

“…49 Because the hydrolysis of polylactide-based polyurethane under acidic conditions was also faster than in neutral media, the cumulative release rate of chlorfenapyr at pH ¼ 5 was slightly higher than at pH ¼ 7, which was consistent with previous results. 26,50…”

Designing polyurethane-based microcapsules with tailored swelling behaviours for enhanced oil recovery

“…The incorporation of isophorone diisocyanate (IPDI) and pentaerythritol in the synthesis of PU microcapsules, which encased water-soluble core materials, has expanded the potential applications of PU microcapsules. 14 Bai et al prepared thermo-expandable microcapsules by using PU as the shell material and n-hexane as the foaming agent. Their research focused on optimizing the encapsulation efficiency by varying the NCO/ OH ratio, revealing that a ratio of 3 yielded the highest efficiency.…”