期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 144, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106317
关键词
Polylactide; Phosphoramides; Mechanical property; Flame retardancy
资金
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJKY19_0463]
- Fundamental Research Funds for the Central Universities [2019B66414]
- National Natural Science Foundation of China [51873196, 21671146, 51573169]
- Australian Research Council [DP190102992, FT190100188]
- Key Research and Development Projects of Zhejiang Province, China [2018C01051, 2019C01098, 2020C04004]
This study designs a series of polyphosphoramides with tunable structures and compositions. By balancing hydrogen bonding and interfacial tension, it increases the tensile strength and toughness of PLA, leading to a desirable UL-94V-0 rating and a high limited oxygen index (LOI).
Intrinsic flammability significantly impedes practical applications of polylactide (PLA), despite many merits. Phosphoramides have shown exceptional flame retardancy efficiency in PLA, but to date it remains a grand challenge to create strong, tough and flame-retardant PLA based on phosphoramides due to lack of fundamental understanding of structure-property correlation. Herein, we design a series of polyphosphoramides (PPDA-x) with tunable structures and compositions. With 1.0 wt% of PPDA-8, tensile strength and toughness of PLA are increased by 11% and 44%, respectively, because of balanced hydrogen-bonding and interfacial tension. Meanwhile, the final PLA achieves a desirable UL-94V-0 rating and a high limited oxygen index (LOI) of similar to 26.8% because phosphorus contents and interfacial tension govern flame retardancy. This work offers a general methodology for creating robust and flame-retardant polymers by molecularly tailoring flame retardants and shedding light on their structure-property relationship.
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