摘要
以甲基丙烯酸(MAA)和丙烯腈(AN)为单体,以偶氮二异丁腈(AIBN)为引发剂,以有机改性蒙脱土(OMMT)为填料,通过单体原位插层聚合的方法,制备了聚甲基丙烯酰亚胺/有机蒙脱土(PMI/OMMT)泡沫。通过傅里叶变换红外(FT-IR)和X射线衍射(XRD)对OMMT的结构进行表征,通过热重分析(TGA)、动态力学热分析(DMA)、垂直燃烧、极限氧指数(LOI)和扫描电镜(SEM)对PMI/4OMMT泡沫热性能、燃烧性能和形貌进行表征,同时对PMI/4OMMT泡沫的力学强度进行分析。结果表明,十六烷基三甲基溴化胺(CTMAB)插层进入钠基蒙脱土(Na-MMT)层间,使层间距由1.25nm增加到2.20nm。制备的PMI/4OMMT泡沫具有良好的成炭性能和较高的玻璃化转变温度,OMMT的加入提高了PMI/4OMMT泡沫的LOI,泡沫呈蜂窝状结构,孔径在0.1~0.4mm之间。力学性能分析表明,PMI/4OMMT泡沫具有较高的力学强度,PMI60/4OMMT泡沫的拉伸强度、弯曲强度和压缩强度分别为1.45MPa、2.11MPa和3.15MPa。
The polymethacrylimide/organo-montmorillonite(PMI/OMMT)foams were prepared from acrylonitrile(AN)and methacrylic acid(MAA)by in situ intercalation polymerization of monomers and free heat foaming.Azobisisobutyronitrile(AIBN)was acted as initiator and OMMT was used as filler.The chemical structures of OMMT were characterized by Fourier transform infrared(FT-IR)and X-ray diffraction(XRD).The thermal properties,combustion properties,morphologies and mechanical properties of the PMI/OMMT foams were investigated in details by thermogravimetric analysis(TGA),dynamic mechanical analysis(DMA),vertical burning tests,limit oxygen index(LOI),scanning electron microscopy(SEM)and universal testing machine.The FT-IR and XRD results show that cetyltrimethylammonium bromide(CTMAB)is intercalated into the layers of sodium montmorillonite(Na-MMT)and the interlayer spacing is increased from 1.25nm to 2.20nm.The results of TGA and DMA demonstrate the prepared PMI/OMMT foams possess excellent char forming capability and higher glass transition temperature(Tg).The LOI values of PMI/OMMT foams are gradually increased with the increase of AN content.The SEM tests indicate that the prepared PMI/4OMMT foams are consisted of the honeycomb structure with the diameter of 0.1~0.4mm.Meanwhile,the obtained PMI/OMMT foams present superior mechanical properties,for example,the tensile,flexural and compressive strength of the PMI60/4OMMT foam are 1.45MPa,2.11MPa and 3.15MPa,respectively.
作者
张浩齐
许苗军
李斌
张志永
Haoqi Zhang;Miaojun Xu;Bin Li;Zhiyong Zhang(College of Chemistry,Chemical Engineering and Resource Utilization,Northeast Forestry University,Harbin 150040,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2020年第3期30-35,共6页
Polymer Materials Science & Engineering
基金
中央高校基本科研业务费专项资金(2572018BC06)。
关键词
聚甲基丙烯酰亚胺泡沫
有机蒙脱土
热性能
燃烧性能
力学性能
polymethacrylimide foams
montmorilonite
thermal property
combustion performance
mechanical properties
