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采用超声微波共辐射技术使聚乙二醇(PEG)在稻草(RS)纤维发生接枝共聚反应。考察了微波功率、超声功率、时间、温度、以及PEG用量对改性程度的影响,获得最佳接枝条件。RS-MDI接枝过程的最佳条件为:稻草与PEG质量比1∶2;微波功率300W,超声波功率270W,反应温度60℃,反应时间60min;RS-MDI与PEG接枝过程的最佳条件为:微波功率300W,超声功率360W,温度60℃,时间60min。FT-IR、SEM、XRD和DSC表征结果表明改性稻草的结构发生改变,并获得了预期的热塑性。稻草接枝共聚物可以在不加任何增塑剂的情况下压制成板。
Polyethylene glycol (PEG) was grafted onto straw (RS) fibers by ultrasonic microwave co-irradiation. The effects of microwave power, ultrasonic power, time, temperature, and amount of PEG on the degree of modification were investigated to obtain the best grafting conditions. The optimal conditions of RS-MDI grafting process were as follows: the mass ratio of straw to PEG was 1: 2; the microwave power was 300W; the ultrasonic power was 270W; the reaction temperature was 60 ℃; the reaction time was 60min; As: microwave power 300W, ultrasonic power 360W, temperature 60 ℃, time 60min. The FT-IR, SEM, XRD and DSC characterization results showed that the structure of the modified straw changed and the desired thermoplasticity was obtained. The straw graft copolymer can be compressed into a sheet without any plasticizer.