Yener Hande Ece, Erdmann Rafael, Jariyavidyanont Katalee, Mapossa António B, Focke Walter W, Hillrichs Georg, Androsch René
Interdisciplinary Center for Transfer-oriented Research in Natural Sciences (IWE TFN), Martin Luther University Halle-Wittenberg, 06099 Halle/Saale, Germany.
Institute for Biopolymers and Sustainability (ibp), University of Applied Sciences Hof, Alfons-Goppel-Platz 1, 95028 Hof/Saale, Germany.
ACS Omega. 2022 Mar 3;7(10):8377-8384. doi: 10.1021/acsomega.1c05897. eCollection 2022 Mar 15.
Bio-sourced and biodegradable poly(butylene succinate) (PBS) strands containing up to 40 m% mosquito-repellent ,-diethyl-3-methylbenzamide (DEET) were obtained by extrusion, for an initial evaluation of the DEET evaporation characteristics and the possible application of such strands as biodegradable slow-release repellent-delivery devices. For DEET concentrations up to 20 m%, DEET is entrapped in the semicrystalline spherulitic superstructure of PBS. In contrast, at higher DEET concentrations, the liquid repellent, at least partially, is not fully incorporated in the PBS spherulites rather than segregates to form an own macrophase. Quantification of the release of DEET to the environment by thermogravimetric analysis at different temperatures between 60 and 100 °C allowed estimation of the evaporation rate at lower service temperatures, suggesting an extremely low release rate with a time constant of the order of magnitude of 1-2 years at 25 °C, independent of the initial concentration.
通过挤出法制备了含有高达40摩尔%驱蚊剂N，N-二乙基-3-甲基苯甲酰胺（DEET）的生物基可生物降解聚丁二酸丁二醇酯（PBS）纤维，用于初步评估DEET的蒸发特性以及此类纤维作为可生物降解缓释驱蚊剂递送装置的潜在应用。对于DEET浓度高达20摩尔%的情况，DEET被包裹在PBS的半结晶球晶超结构中。相比之下，在较高的DEET浓度下，液态驱蚊剂至少部分未完全融入PBS球晶中，而是分离形成一个独立的宏观相。通过在60至100°C之间的不同温度下进行热重分析来量化DEET向环境中的释放，从而估算出较低使用温度下的蒸发速率，这表明在25°C时释放速率极低，时间常数约为1 - 2年，且与初始浓度无关。
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