Tuning thermal release kinetics of soy oil from organic nanoparticles using variable synthesis conditions
Tuning thermal release kinetics of soy oil from organic nanoparticles using variable synthesis conditions作者机构：University of Freiburg Freiburg Research Institute for Advances Studies (FRIAS) Faculty for Environment and Natural Resources Chair of Bio-based Materials Engineering Werthmannstrasse 6 D-79085 Freiburg Germany Ghent University Department of Textiles Technologiepark 907 B-9052 Zwijnaarde Belgium Topehim N.K Nijverheidsstraat 98 B-2160 Wommelgem Belgium
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2016年第14卷第3期
页 面：54-65页
核心收录：
学科分类：090403[农学-农药学(可授农学、理学学位）] 07[理学] 0817[工学-化学工程与技术] 070205[理学-凝聚态物理] 08[工学] 09[农学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0904[农学-植物保护] 0703[理学-化学] 0702[理学-物理学]
基 金：the Robert Bosch Foundation for support as Junior professor in Sustainable Use of Natural Materials (Foresnabproject, 2011-2016) the State of Baden-Wurttemberg for financial support in the Juniorprofessorenprogramm (NaCoPa- Project, 2012-2015)
主 题：Soy oil Nanoparticle Encapsulation Release
摘 要：The thermal release properties of soy oil from poly（styrene-co-maleimide） nanoparticles containing 50 wt% encapsulated oil have been quantified as a function of temperature and time. The effects of dif- ferent synthesis conditions on the thermal stability of the nanoparticles and their oil release have been evaluated, i.e., by gradually increasing the amount of ammonium hydroxide used for the imidization of poly（styrene-co-maleic anhydride）. First, the intrinsic thermal properties of the oil-filled nanoparti- cles were analysed by differential scanning calorimetry, which revealed an exothermal reaction related to the oil release and a suppression of the glass transition that may be masked owing to the complex structure of the hybrid nanoparticles. The isothermal scans showed different rates of oil release after a post-imidization reaction. The oil release was better followed by dynamic mechanical analysis, which illustrated changes in visco-elastic properties expressed by the maximum in the loss factor that related to the amount of released oil. Depending on the amount of ammonium hydroxide, the oil started to release below the glass transition temperature at various rates. Thermal release profiles of the oil we re quantified by infrared and Raman spectrocopy after heating for 2 min to 6 h at 125 to 250 ℃, based on variations in oil-related and imide-related absorption bands. The oil release increased below and above the glass transition temperature, following a parabolic trend, and progressively decreased at higher ammonium hydroxide concentrations, in parallel with higher imide content and changes in imide conformation. The kinetics and mechanism of the oil release can be described by the Korsmeyer-Peppas model, suggesting a dominating diffusion mechanism that is influenced by further imidization of the polymer matrix during heating.
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