环境因素交互影响下可降解塑料PBAT的老化行为

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摘要为研究不同环境因素交互影响下可降解塑料的老化行为,以聚对苯二甲酸-己二酸丁二酯 (PBAT)为目标物,通过温度、湿度、光照为因素设置均匀和交互实验,探究不同因素交互影响下PBAT老化过程及潜在机理.多因素交互实验结合扫描电镜(SEM)、电子能谱面(EDS)的分析结果表明湿度对PBAT老化行为的影响最大,温度对PBAT老化行为的影响最小,且温度30.0℃、湿度60%、紫外光条件下老化效果最明显.通过X射线光谱(XPS)和X射线衍射(XRD)进一步分析PBAT在不同老化过程中化学键和结晶度的变化,其结果表明:在湿度和紫外光交互作用下,PBAT的碳氧双键减少而碳氧单键增加,碳氧双键被破坏形成了羧基,部分官能团中氧原子置换氢原子,有得失电子的行为出现,在其表面生成小分子物质CO₂和π-π键;在此交互老化过程中,PBAT的结晶度增大.

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关键词 ：可降解塑料, 聚对苯二甲酸-己二酸丁二酯, 老化, 环境因素, 交互影响

Abstract：In order to study the aging behavior of degradable plastics under the interaction of different environmental factors, poly (butyleneadipate-co-terephthalate) (PBAT) was used as the target. The aging process and potential mechanism of PBAT under the interaction of different factors were investigated by setting uniform and interactive experiments with temperature, humidity and light as factors. The results of multi-factor interaction experiments combined with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that humidity had the greatest influence on the aging behavior of PBAT, and temperature had the least influence on the aging behavior of PBAT. The aging effect was the most obvious under the conditions of temperature 30.0 °C, humidity 60% and ultraviolet light. The changes of chemical bonds and crystallinity of PBAT during different aging processes were further analyzed by X-ray spectroscopy (XPS) and X-ray diffraction (XRD). The results showed that under the interaction of humidity and ultraviolet light, the carbon-oxygen double bond of PBAT decreased and the carbon-oxygen single bond increased. The carbon-oxygen double bond was destroyed to form a carboxyl group. The oxygen atoms in some functional groups replaced the hydrogen atoms, and the behavior of gain and loss of electrons appeared. The small molecule CO₂ and π-π bonds were formed on the surface; in this interactive aging process, the crystallinity of PBAT increased.

Key words： degradable plastics PBAT aging environmental factors interactive impact

收稿日期: 2023-05-24

PACS:

X171

基金资助:国家自然科学基金资助项目(52270196;52000018);重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0133; CSTB2022TIAD-KPX0198);重庆市水利科技项目(CQSLK-2022001);重庆交通大学研究生科研创新项目资助(2023S0036)

通讯作者: 孙姣霞,副教授,sjx@cqu.edu.cn E-mail: sjx@cqu.edu.cn

作者简介: 蒋晖(1986-),女,湖南邵阳人.讲师,博士,主要从事资源与水环境研究.发表论文10余篇.956348992@qq.com.

引用本文:

蒋晖, 朱丽帆, 杨超, 刘秀丽, 刘欣, 孙姣霞. 环境因素交互影响下可降解塑料PBAT的老化行为[J]. 中国环境科学, 2023, 43(12): 6530-6538. JIANG Hui, ZHU Li-fan, YANG Chao, LIU Xiu-li, LIU Xin, SUN Jiao-xia. The aging behavior of degradable plastic PBAT under the interaction of environmental factors. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6530-6538.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I12/6530

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