Scholarlink

<p>This research aimed to prepare a novel temperature sensitive microcapsule for encapsulation and temperature sensitive controlled release of liquid fragrances. Accordingly, polyurethane with temperature sensitivity effect was synthesized by polycaprolactone(PCL), 4,4’ - diphenyl diisocyanate(MDI) and 1,4-butanediol(BDO) through two-step solution block copolymerization technology, which was used as a shell material. The core material was formed by emulsification of Paraffin(Pw) and rosemary essential oil(REO). The shell materials were polymerized by in-situ polymerization to prepare the temperature sensitive microcapsules TSPU@Pw. Effects of encapsulation temperature, time, and core-wall ratio on yield and encapsulation efficiency of the microcapsules were investigated. REO release behavior of TSPU@Pw was tested and its temperature response characteristics was verified. The results indicated that the required microcapsules were prepared by the method proposed successfully. Under the conditions of encapsulation temperature of 75℃, encapsulation time of 2&#xa0;h, and core wall mass ratio of 0.6, the encapsulation efficiency of TSPU@Pw was 70.88%, and the corresponding temperature sensitivity range was 38–45℃. At a phase transition temperature of 41.7℃, the release rate of REO increased by 77.45% after 240&#xa0;min compared to 30℃, demonstrating a significant temperature responsive control release effect. The application of Korsmeyer Peppas model could effectively characterize the release characteristics of REO in microcapsules, could be attributed to the presence of capillary effects based on shell pores in the release of REO.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Preparation and characterization of thermosensitive microcapsules: polyurethane shell encapsulating paraffin and rosemary essential oil core

  • 期刊论文

  • 发表日期：

    2026年3月16日

查看全文
  • Yuhang Mei,
  • Xueyu Cheng,
  • Yi Chen,
  • Xinyuan Zhou,
  • Lixin Lu

摘要

This research aimed to prepare a novel temperature sensitive microcapsule for encapsulation and temperature sensitive controlled release of liquid fragrances. Accordingly, polyurethane with temperature sensitivity effect was synthesized by polycaprolactone(PCL), 4,4’ - diphenyl diisocyanate(MDI) and 1,4-butanediol(BDO) through two-step solution block copolymerization technology, which was used as a shell material. The core material was formed by emulsification of Paraffin(Pw) and rosemary essential oil(REO). The shell materials were polymerized by in-situ polymerization to prepare the temperature sensitive microcapsules TSPU@Pw. Effects of encapsulation temperature, time, and core-wall ratio on yield and encapsulation efficiency of the microcapsules were investigated. REO release behavior of TSPU@Pw was tested and its temperature response characteristics was verified. The results indicated that the required microcapsules were prepared by the method proposed successfully. Under the conditions of encapsulation temperature of 75℃, encapsulation time of 2 h, and core wall mass ratio of 0.6, the encapsulation efficiency of TSPU@Pw was 70.88%, and the corresponding temperature sensitivity range was 38–45℃. At a phase transition temperature of 41.7℃, the release rate of REO increased by 77.45% after 240 min compared to 30℃, demonstrating a significant temperature responsive control release effect. The application of Korsmeyer Peppas model could effectively characterize the release characteristics of REO in microcapsules, could be attributed to the presence of capillary effects based on shell pores in the release of REO.