Diammonium phosphate-modified ramie fiber reinforced polylactic acid composite and its performances on interfacial, thermal, and mechanical properties

ABSTRACT

In this study, the properties of molded ramie fibers reinforced with polylactic acid (PLA) biocomposites were investigated. Before preparation of composites, diammonium phosphate (DAP) was applied to the surface of ramie fibers with and without pretreatments to analyze the interfacial adhesion of ramie–PLA composite. Wettability and adhesion behavior of ramie fibers in the PLA resin were characterized by contact angle (CA) measurements. The surface chemical analysis was performed by Fourier transform infrared spectroscopy (FTIR). The thermal properties were recorded using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The wetting analysis results showed that the introduction of DAP treatment to ramie fibers significantly improved the wetting behavior of ramie in the PLA resin. Similarly, the results of TGA indicated that DAP treatment substantially decreased the degradation temperature of the composites. The result of FTIR was also consistent with the results of wettability, TGA, and DSC for the observed changes of peaks in the transmission spectrum.

摘要

在本研究中，研究了用磷酸二铵（DAP）处理的苎麻纤维对增强聚乳酸（PLA）复合材料的性能的影响。在制备复合材料之前，将DAP分别应用于经过预处理和未经过预处理的苎麻纤维表面，以分析苎麻/PLA复合材料的界面粘附性。本实验采用接触角的测量方法，对苎麻纤维在PLA树脂中的润湿性和粘合性能进行了表征。通过傅里叶变换红外光谱（FTIR）对表面化学分析进行了描述。使用热重分析（TGA）和差示扫描量热法（DSC）记录热性能。湿法分析结果表明，对苎麻纤维进行DAP处理，显着提高了PLA树脂中苎麻的润湿性能。同样地，TGA的结果表明DAP处理显著降低了复合材料的降解温度。 FTIR的结果用于观察透射光谱中峰值的变化，与TGA的润湿度，TGA和 DSC的结果一致。

KEYWORDS:

• Surface treatment
• ramie fiber
• PLA
• interfacial
• thermal
• mechanical property

关键词:

• 表面处理
• 苎麻纤维
• PLA
• 界面
• 热
• 机械性能

Additional information

Funding

The first author would like to acknowledge financial support from the Shanghai government inform of Shanghai government scholarship for his research study at Donghua university.