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摘要
通过熔融法制备热塑性木薯淀粉(TPS)/低密度聚乙烯(LDPE)/二氧化硅(SiO2)复合薄膜,研究不同表面性质SiO2对复合材料的力学性能、塑化性能及结构变化规律。结果表明:添加疏水SiO2后使TPS/LDPE/SiO2复合材料的塑化扭矩降低、塑化时间增加;添加疏水SiO2(TSP-L12)的TPS/LDPE/SiO2复合材料的拉伸强度最高,添加亲水SiO2(TSP-H10)时拉伸应变最高。疏水SiO2能更好地发挥异相成核作用,形成较清晰的球晶,且不同表面性质的SiO2会改变TPS/LDPE/SiO2复合材料的晶型。添加亲水SiO2时在基体界面粘接牢固,但容易发生团聚现象;疏水SiO2在基体中分散较好,但容易发生剥落现象。
Abstract
Thermoplastic cassava starch (TPS) /low density polyethylene (LDPE) /silica (SiO2) composite film was prepared by melting method.The mechanical and plasticizing properties,and structural change of the composites with different surface properties of silica were studied.The results shown that the plasticizing torque of TPS/LDPE/SiO2 decreased and the plasticizing time increased after adding hydrophobic SiO2.The tensile strength of TPS/LDPE/SiO2 with hydrophobic SiO2 (TSP-L12) was the highest,and the tensile strain of TPS / LDPE / SiO2 with hydrophilic SiO2 (TSP-H10) was the highest.Hydrophobic SiO2 can play the better role in heterogeneous nucleation and formed clear spherulites,and different surface properties of SiO2 will change the crystal form of TPS/LDPE/SiO2.When the hydrophilic SiO2 was added,it was easy to agglomerate at the interface of the matrix.when hydrophobic SiO2 was added,it could be well dispersed in the matrix,but it was easy to exfoliate.
关键词
热塑性木薯淀粉
/
亲水
/
疏水
/
二氧化硅
Key words
thermoplastic cassava starch
/
hydrophilic
/
hydrophobic
/
silica
不同表面性质SiO2对热塑性木薯淀粉/LDPE复合材料薄膜的力学性能和结构影响[J].
化工新型材料, 2022, 50(5): 266-269 DOI:10.19817/j.cnki.issn1006-3536.2022.05.054
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基金资助
国家自然科学基金(51663002);广西自然科学基金项目(2020GXNSFAA159113)
