摘要
通过水浴法,采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH-560)对凹凸棒土(ATP)进行表面修饰。以聚对苯二甲酸丁二醇酯(PBT)为基体,经熔融插层共混,制备PBT基ATP复合材料。研究了ATP的晶型结构、表面形貌以及分散特性。通过拉伸性能、缺口冲击强度测试对复合材料的力学性能进行评估,并分析了复合材料的拉伸断口形貌,探讨了ATP对PBT基体的增强机制。结果表明:ATP为典型的纤维棒状结构,表面凹凸不平,直径为30 nm左右,基于ATP表面存在的羟基,经脱水缩合KH-560成功接枝到ATP表面,并促使ATP晶面间距增大,晶粒度发生细化,使其分散特性得到改善,表面改性剂与PBT分子链之间相互渗透,形成具有一定厚度的柔性界面层,两相之间的界面黏附特性增强。对于3%(除特殊说明外,均为质量分数)酸洗后的ATP和KH-560表面修饰的ATP填充的PBT基复合材料,它们的拉伸强度分别为58.1 MPa与61.4 MPa,相对于纯PBT分别提升了13.3%与19.7%。
The attapulgite(ATP)was surface modified byγ-glycidyl etheroxy propyltrimethoxy silane coupling agent(KH-560)via the water bath method.And the poly(butylene terephthalate)(PBT)matrixed-composites filled with attapulgite were prepared by melt intercalation blending technique.The crystal structure,surface morphology,and dispersion characteristics of ATP were characterized.The mechanical properties of the composite were investigated by tensile and notch impact strength testing.The tensile fracture morphology of the composite was analyzed.In addition,the reinforcement mechanism of ATP on PBT matrix was discussed.The results show that the ATP presents a typical fiber rod structure,with a rough and uneven surface and a diameter of about 30 nm.The KH-560 is successfully grafted on the surface of ATP through dehydration and condensation based on the presence of hydroxyl groups on the surface of ATP,which results in an increase in the crystal plane spacing of ATP,refinement of crystalline grain size,and the improvement of dispersion in PBT matrix.In case of the PBT matrixed-composites filled with modified ATP by KH-560,the long organic chain of modifiers on the surface of ATP and the molecular chain of PBT infiltrate each other,which results the formation of flexible interface layer with a certain thickness.Notably,the interfacial adhesion characteristics between the ATP and PBT matrix are enhanced.When the mass fractions of acid washed ATP and modified ATP by KH-560 are 3wt%,the tensile strength of corresponding composites reaches up to 58.1 MPa and 61.4 MPa,respectively,increasing by 13.3%and 19.7%compared to pure PBT.
作者
康成虎
KANG Chenghu(Department of Physics and Electronic Information Engineering,Lyuliang University,Lyuliang 033001,Shanxi,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第18期271-276,共6页
Materials Reports
基金
山西省青年科学研究项目(202103021223385)。
