Bio-based alternative for encapsulating fragrance oils in epoxy resin microcapsules

环氧树脂 材料科学 化学工程 复合材料 化学 热固性聚合物
作者
Xue Wang,Anna-Christina Amason,Yabin Lei,Ron Gabbard,Julie Ann Wieland,Richard A. Gross
出处
期刊:Colloids and Surfaces A: Physicochemical and Engineering Aspects [Elsevier BV]
卷期号:: 128387-128387
标识
DOI:10.1016/j.colsurfa.2022.128387
摘要

There is increased pressure on microcapsule manufacturers to develop microcapsules following green chemistry principles and using safe biobased materials. Diphenolic acid, prepared from cellulose-derived levulinic acid and phenol, was used as a replacement for bisphenol-A. The resulting diepoxy resin diglycidyl ether diphenolate methyl ester (DGEDP-methyl ester) was incorporated in the fragrance oil and reacts with hexamethylenediamine (HMDA) to build capsule walls by interfacial polymerization. The biobased emulsifier gum arabic at 2.5 wt% was found to provide good capsule formation. The effect of DGEDP-methyl ester/HMDA ratios on various capsule properties was studied. A low HMDA concentration at 0.75 wt% yields deformed capsules with lower microencapsulation efficiency (EE< 90%) and lower stability (oil leaking > 26.3% after acid treatment, and > 87.2% after sonication). A medium HMDA concentration (1 wt%) with 2 - 4 wt% DGEDP-methyl ester generates spherical capsules with higher EE (91.2 - 96.5%) and improved stability (oil leaking was < 20.3% after acid treatment, and < 76% after sonication). Increasing the content of HMDA to 1.25 wt% along with ≥ 2 wt% DGEDP-methyl ester led to extensive aggregation with a slight increase in EE at the expense of capsule stability. These observations demonstrate that DGEDP-methyl ester/HMDA interfacial polymerization is a promising biobased alternative for isocyanate and formaldehyde approaches for oil encapsulation.
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