采用共沉淀法将磷钨酸根(PWA)柱撑插层层状双金属氢氧化物(LDHs)制备了MgAl-LDHs-PWA,通过X射线衍射(XRD)、红外光谱(FT-IR)、扫描电镜(SEM)等手段对其结构和形貌进行了表征,并对其热稳定性进行分析。结果表明:PWA插入LDHs层间,且MgAl-LDHs-PWA的热稳定性与残余量得到大幅度提升。同时,对环氧树脂(EP)/MgAl-LDHs-PWA复合材料的阻燃性能及力学性能进行了评价。结果表明:当添加质量为20%时,EP/MgAl-LDHs-PWA复合材料的极限氧指数(LOI)为26.2%,垂直燃烧(UL-94)达到V-0等级。EP/MgAl-LDHs-PWA复合材料的拉伸强度和断裂伸长率分别为29.28MPa和3.6%。
Phosphotungstic acid intercalated layered double hydroxides (MgAl-LDHs-PWA) were prepared by co-precipitation method.The structure and morphology of the MgAl-LDHs-PWA materials were characterized by XRD,FT-IR and SEM,and the thermal stability was also analyzed.The results indicated that the MgAl-LDHs were successfully intercalated by PWA anion.TGA confirmed that both the thermal stability and the residue formation of the MgAl-LDHs-PWA materials were significantly enhanced.The flame retardancy and mechanical properties of EP/MgAl-LDHs-PWA composites were evaluated.The results showed that the composites could achieve the LOI value of 26.2% and the UL-94 of V-0 level when the added mass was 20wt%.The mechanical testing revealed that the tensile strength and the elongation at break of EP/MgAl-LDHs-PWA were 29.28MPa and 3.6%,respectively.
[1] Wang H,Yuan J,Zhu Z,et al.High performance epoxy resin composites modified with multifunctional thiophene/phosphaphenanthrene-based flame retardant:excellent flame retardance,strong mechanical property and high transparency[J].Composites Part B:Engineering,2021,227:109392.
[2] Zhang H,Li K,Wang M,et al.The preparation of a composite flame retardant of layered double hydroxides and α-zirconium phosphate and its modification for epoxy resin[J].Materials Today Communications,2021,28:102711.
[3] Zhang Z,Qin J,Zhang W,et al.Synthesis of a novel dual layered double hydroxide hybrid nanomaterial and its application in epoxy nanocomposites[J].Chemical Engineering Journal,2020,381:122777.
[4] 胡爱莲,滑亚婷,杜春贵,等.LDHs的层间阴离子插层技术研究进展及其在材料阻燃中的应用前景[J].化工新型材料,2021,49(10):240-244,248.
[5] Yan K,Xie X,Li J,et al.Preparation,characterization,and catalytical application of MgCoAl-hydrotalcite-like compounds[J].Journal of Natural Gas Chemistry,2007,16(4):371-376.
[6] Gomez N A G,Wypych F.Nanocomposites of polyethylene and ternary (Mg+Zn/Al) layered double hydroxide modified with an organic UV absorber[J].2019,26(8):1-10.
[7] Huo W,Cao T,Liu X,et al.Anion intercalated layered-double-hydroxide structure for efficient photocatalytic NO remove[J].Green Energy & Environment,2019,4(3):270-277.
[8] Li L,Jiang K,Qian Y,et al.Effect of organically intercalation modified layered double hydroxides-graphene oxide hybrids on flame retardancy of thermoplastic polyurethane nanocomposites[J].Journal of Thermal Analysis and Calorimetry,2020,142:723-733.
[9] Ye L,Qu B.Flammability characteristics and flame retardant mechanism of phosphate-intercalated hydrotalcite in halogen-free flame retardant EVA blends[J].Polymer Degradation and Stability,2008,93(5):918-924.
[10] Jin L,Zeng H Y,Du J Z,et al.Intercalation of organic and inorganic anions into layered double hydroxides for polymer flame retardancy[J].Applied Clay Science,2020,187:105481.
[11] Xu S,Zhang M,Li S Y,et al.Intercalation of a novel containing nitrogen and sulfur anion into hydrotalcite and its highly efficient flame retardant performance for polypropylene[J].Applied Clay Science,2020,191:105600.
[12] Jia Y H,Liu Z H.Preparation of borate anions intercalated MgAl-LDHs microsphere and its calcinated product with superior adsorption performance for Congo red[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2019,575:373-381.
[13] Zhang S,Yan Y,Wang W,et al.Intercalation of phosphotungstic acid into layered double hydroxides by reconstruction method and its application in intumescent flame retardant poly (lactic acid) composites[J].Polymer Degradation and Stability,2018,147:142-150.
[14] Huang Z,Wang Q,Wu Y,et al.Phosphotungstic acid intercalated Zn,Al-layered double hydroxides/nanocellulose based 3D lightweight foam thermal insulation materials[J].Materials Research Express,2021,8:025009.
[15] Wu K,Xu S,Tian X Y,et al.Renewable lignin-based surfactant modified layered double hydroxide and its application in polypropylene as flame retardant and smoke suppression[J].International Journal of Biological Macromolecules,2021,178:580-590.
基金资助
广东工业大学横向项目(21HK0340)
PDF
