Robust composite-shell microcapsules via pickering emulsification

ACS Applied Materials & Interfaces
Marcia W PatchanJason J Benkoski

Abstract

Microencapsulation technology has been increasingly applied toward the development of self-healing paints. Added to paint as a dry powder prior to spraying, the microcapsules store a liquid that can repair the protective barrier layer if released into a scratch. However, self-healing will not occur unless the microcapsules can withstand spray-painting, aggressive solvents in the paint, and long-term exposure to the elements. We have therefore developed a one-pot synthesis for the production of Pickering microcapsules with outstanding strength, solvent resistance, and barrier properties. Octadecyltrimethoxysilane-filled (OTS) microcapsules form via standard interfacial polycondensation, except that silica nanopowder (10-20 nm diameter) replaces the conventional surfactant or hydrocolloid emulsifier. Isophorone diisocyanate (IPDI) in the OTS core reacts with diethylenetriamine, polyethylenimine, and water to form a hard polymer shell along the interface. Compared to pure polyurea, the silica-polyurea composite improves the shelf life of the OTS by 10 times. The addition of SiO2 prevents leaching of OTS into xylenes and hexanes for up to 80 days, and the resulting microcapsules survive nebulization through a spray gun at 620 kPa i...Continue Reading

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Citations

Sep 2, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Lance Michael BairdRengaswamy Srinivasan
May 19, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Chia-Chen LiJia-Wei Chen
Jun 5, 2019·Journal of Biomaterials Science. Polymer Edition·Xue MiYu Liu
Jun 2, 2017·Topics in Current Chemistry·Alexandra Latnikova, Monika Jobmann
May 31, 2018·ACS Applied Materials & Interfaces·Dong Jin KangSushant Anand
Feb 8, 2019·ACS Applied Materials & Interfaces·Dawei SunJinglei Yang
Jan 19, 2021·ACS Biomaterials Science & Engineering·Yongfeng WangXiaoqin Wang

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