Mustapha Abdullah Naseer, AlMheiri Maitha, AlShehhi Nujood, Rajput Nitul, Joshi Sachin, Antunes Ana, AlTeneiji Mohamed
Technology Innovation Institute, Masdar City, Abu Dhabi P.O. Box 9639, United Arab Emirates.
Polymers (Basel). 2022 May 7;14(9):1907. doi: 10.3390/polym14091907.
In this work, tung oil was utilised as a catalyst-free self-healing agent, and an in-situ polymerization process was applied to encapsulate the tung oil core with a poly(urea-formaldehyde) (PUF) shell. The conventional poly(ethylene-alt-maleic-anhydride) (PEMA) polymer was compared to a more naturally abundant gelatin (GEL) emulsifier to compare the microcapsules' barrier, morphological, thermal, and chemical properties, and the crystalline nature of the shell material. GEL emulsifiers produced microcapsules with a higher payload (96.5%), yield (28.9%), and encapsulation efficiency (61.7%) compared to PEMA (90.8%, 28.6% and 52.6%, respectively). Optical and electron microscopy imaging indicated a more uniform morphology for the GEL samples. The thermal decomposition measurements indicated that GEL decomposed to a value 7% lower than that of PEMA, which was suggested to be attributed to the much thinner shell materials that the GEL samples produced. An innovative and novel focused ion beam (FIB) milling method was exerted on the GEL sample, confirming the storage and release of the active tung oil material upon rupturing. The samples with GEL conveyed a higher healing efficiency of 91%, compared to PEMA's 63%, and the GEL samples also conveyed higher levels of corrosion resistance.
在这项工作中，桐油被用作无催化剂的自修复剂，并采用原位聚合法用聚（脲 - 甲醛）（PUF）壳封装桐油核。将传统的聚（乙烯 - 马来酸酐）（PEMA）聚合物与来源更丰富的明胶（GEL）乳化剂进行比较，以对比微胶囊的阻隔、形态、热和化学性质，以及壳材料的结晶性质。与PEMA（分别为90.8%、28.6%和52.6%）相比，GEL乳化剂制备的微胶囊具有更高的载药量（96.5%）、产率（28.9%）和包封率（61.7%）。光学和电子显微镜成像表明GEL样品的形态更均匀。热分解测量表明，GEL的分解值比PEMA低7%，这被认为是由于GEL样品产生的壳材料更薄。一种创新的聚焦离子束（FIB）铣削方法应用于GEL样品，证实了活性桐油材料在破裂时的储存和释放。与PEMA的63%相比，含有GEL的样品具有91%的更高修复效率，并且GEL样品还具有更高的耐腐蚀性。
