Thumwong Arkarapol, Darachai Jitsuna, Thamrongsiripak Nuatawan, Tokonami Shinji, Ishikawa Tetsuo, Saenboonruang Kiadtisak
Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
Special Research Unit of Radiation Technology for Advanced Materials (RTAM), Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
Antioxidants (Basel). 2023 May 18;12(5):1119. doi: 10.3390/antiox12051119.
As the world is facing rapid increases in agricultural wastes that greatly affect global health, the environment, and economies, this work aims to alleviate such issues by introducing simple uses of waste fruit peel powder (FPP) derived from mangosteen (MPP), pomelo (PPP), or durian (DPP), as dual natural antioxidants and reinforcing bio-fillers in natural rubber latex (NRL) gloves. A thorough investigation was undertaken of the relevant characteristics for both FPP (morphological, functional groups, particle sizes, and thermals stability) and NRL gloves (morphological, functional groups, density, color, thermal stability, and mechanical properties-both before and after thermal/25 kGy gamma aging). The results indicated that the initial addition (2-4 parts per hundred parts of rubber by weight; phr) of FPP to NRL composites generally enhanced the strength and elongation at the break of the specimens, with the levels of the improvement varying depending on the type and content of FPPs. In addition to the reinforcing effects, the FPP also offered natural antioxidant properties, evidenced by higher values of aging coefficients for all FPP/NRL gloves under either thermal or 25 kGy gamma aging than those of pristine NRL. Furthermore, by comparing the tensile strength and elongation at break of the developed FPP/NRL gloves with the requirements for medical examination latex gloves according to ASTM D3578-05, the recommended FPP contents for actual glove production were 2-4 phr for MPP, 4 phr for PPP, and 2 phr for DPP. Consequently, based on the overall outcomes, the FPPs of interest showed promising potential for utilization as simultaneous natural antioxidants and reinforcing bio-fillers in NRL gloves, which would not only enhance the strength and ability of the gloves to resist oxidative degradation from heat and gamma irradiation but also increase their economical value as well as reducing the amounts of the investigated wastes.
由于全球面临的农业废弃物迅速增加,对全球健康、环境和经济产生了极大影响,这项工作旨在通过介绍山竹果皮粉(MPP)、柚子果皮粉(PPP)或榴莲果皮粉(DPP)作为双重天然抗氧化剂以及天然橡胶乳胶(NRL)手套中增强型生物填料的简单用途来缓解此类问题。对FPP(形态、官能团、粒径和热稳定性)和NRL手套(形态、官能团、密度、颜色、热稳定性以及热/25 kGy伽马老化前后的机械性能)的相关特性进行了全面研究。结果表明,向NRL复合材料中初始添加(每100份橡胶中添加2 - 4份重量;phr)FPP通常会提高试样的强度和断裂伸长率,改善程度因FPP的类型和含量而异。除了增强作用外,FPP还具有天然抗氧化性能,在热老化或25 kGy伽马老化条件下,所有FPP/NRL手套的老化系数值均高于原始NRL手套,证明了这一点。此外,通过将所开发的FPP/NRL手套的拉伸强度和断裂伸长率与ASTM D3578 - 05规定的医用检查乳胶手套要求进行比较,实际手套生产中推荐使用的FPP含量为:MPP为2 - 4 phr,PPP为4 phr,DPP为2 phr。因此,基于总体结果,所关注的FPP在用作NRL手套中的同时天然抗氧化剂和增强型生物填料方面显示出有前景的潜力,这不仅会提高手套的强度以及抵抗热和伽马辐射氧化降解的能力,还会增加其经济价值,并减少所研究废弃物的数量。