PA6/蒙脱土纳米复合材料的力学性能研究

利用未改性蒙脱土和两种季胺盐改性蒙脱土与尼龙(PA)6混合,成功制备得到了不同结构的PA6/蒙脱土纳米复合材料.X射线衍射图谱和力学性能分析表明,季胺盐改性剂可以插入蒙脱土片层之间,使蒙脱土片层扩张,层间距增大.与PA6相比,制备得到的三种纳米复合材料的力学性能都有不同程度的提高.改性蒙脱土与PA6表现出良好的相容性,...     

HIPS／OMMT纳米复合材料的性能研究

采用熔融插层法制备出了高抗冲聚苯乙烯(HIPS)/有机改性蒙脱土(OMMT)纳米复合材料,研究了OMMT用量对复合材料力学性能、阻燃性能和热稳定性的影响,并分析了OMMT在高抗冲聚苯乙烯基体中的分散状态.结果表明,OMMT的加入有助于提高高抗冲聚苯乙烯基体的力学性能、阻燃性能和热稳定性.熔融插层法可以使高抗冲聚苯乙烯的大分子链有效地插人到OMMT的片层之间.     

PP/PA6/OMMT复合材料力学性能与结晶性能的研究

采用3种不同有机改性过的蒙脱土(牌号为DK2,DK3,DK5)熔融插层法制备了PP/PA6/OMMT纳米复合物材料,在此基础上使用1%～7%的DK2的蒙脱土再次制备PP/PA6/OMMT纳米复合物材料,借助力学性能测试和差示扫描量热法(DSC)对体系的力学性能和结晶性能进行了研究。结果表明:使用DK2制备的复合材料的力学性能优于使用DK3和DK5制备的复合材料的力学性能;相对于纯PP,PP/PA6/OMMT纳米复合物材料随OMMT含量的增加,拉伸强度和弯曲强度是先增加后降低,最大下降幅度分别为8.7%和5.3%;冲击韧性一直上升达到9.61kJ/m2。OMMT的加入,对PP/PA6有异相成核的作用,提高PP/PA6的结晶速率和结晶度。     

三元乙丙橡胶/蒙脱土纳米复合材料Ⅲ.制备、表征及有机插层剂的选择

以长链烷基季铵盐、带有羟基或苄基的有机季铵盐为插层剂,对钠基蒙脱土进行改性后得到了有机蒙脱土。在100份(质量,下同)EPDM中加入15份有机蒙脱土或40份高耐磨炭黑制备了二者的纳米复合材料。X射线衍射和透射电镜分析表明,由带有羟基插层剂改性的钠基蒙脱土制备的纳米复合材料为剥离型,而其他2种为插层型。有机蒙脱土填充的纳米复合材料的力学性能与高耐磨炭黑填充者相当。与EPDM相比,剥离型纳米复合材料的拉伸强度提高了3．4倍,透气率降低了近40％。     

聚酰胺6/环氧树脂改性蒙脱土纳米复合材料的制备与性能

采用环氧树脂改性蒙脱土（MMT）得到有机化蒙脱土（OMMT）,再用熔融插层法制备了聚酰胺6 （PA6）/ OMMT纳米复合材料。采用X射线衍射仪、透射电子显微镜、万能材料试验机、热重分析仪等研究了PA6/OMMT复合材料的形态结构、力学性能和热稳定性。结果表明,经环氧树脂改性得到的OMMT的层间距明显增加,从未改性的1.22 nm增加到5.13 nm,并以纳米尺度分散于PA6基体中;随着OMMT含量的增加,PA6/ OMMT复合材料的强度和模量增加,热变形温度提高,其拉伸强度可达76 MPa,弯曲模量达到3.462 GPa,热变形温度为134 ℃;PA6/ OMMT复合材料失重10 %时的温度为422 ℃,比纯PA6的406 ℃提高了16 ℃,改善了PA6的热稳定性。     

有机插层剂对聚酰胺6／MMT纳米复合材料制备的影响研究

以烷基胺、季铵盐和氨基酸作为有机插层剂与蒙脱土片层进行阳离子交换，制备出层间距不同的有机蒙脱土。采用熔融插层法和原位聚合法分别制备聚酰胺（R％）／蒙脱土（MMT）纳米复合材料，并利用XRD、FT-IR、TEM对有机蒙脱土及纳米复合材料进行结构表征。研究结果表明：用烷基胺、季铵盐和氨基酸有机插层剂改性的蒙脱土层间距由原来的1．25nm分别增大到3．21nm、3．99nm和1．82m；季铵盐有机插层剂更适用于熔融插层法制备PA6／MMT纳米复合材料，而氨基酸有机插层剂更适用于原位聚合法制备PA6／MMT纳米复合材料。     

PMMA/蒙脱土纳米复合材料的结构及热性能

以甲基丙烯酸二甲胺基乙酯和1-溴正十六烷为原料合成了1种新型的带双键长碳链季铵盐甲基丙烯酰氧乙基十六烷基二甲基溴化铵(MHAB).用MHAB对钠基蒙脱土进行改性得到有机蒙脱土(OMMT).通过本体原位插层聚合制备了的聚甲基丙烯酸甲酯/蒙脱土纳米复合材料.MHAB的结构通过核磁共振氢谱(1H-NMR)表征.X射线衍射(XRD)测得OMMT的001面层间距(d001)从1.25 nm扩大到2.72 nm.XRD和透射电镜(TEM)测试证明蒙脱土质量分数为5%,8%时完全以剥离片层形式存在于复合材料中.差示扫描量热仪(DSC)和热失重仪(TG)测试表明复合材料的玻璃化转变温度和外推起始热失重温度都随着蒙脱土的含量增加而提高.     

母料法制备尼龙6/蒙脱土纳米复合材料及其性能

以高流动性聚丙烯接枝马来酸酐(PP-g-MAH)为载体树脂,制备了接枝聚丙烯/有机蒙脱土插层母料,并以此为增强剂制备了PA6/接枝聚丙烯/有机蒙脱土纳米复合材料,研究了有机蒙脱土(OMMT)含量对复合体系力学性能和耐热性能的影响。通过X射线衍射(XRD)、透射电子显微镜(TEM)研究了复合材料的微观结构。结果表明:在所制备的插层母料中,PP-g-MAH大分子能够部分插入OMMT的晶片层间,其层间距有所增大。母料法制备的PA6/接枝聚丙烯/有机蒙脱土纳米复合材料的力学性能得到了较大提高,当OMMT含量为6%时,拉伸强度和弯曲强度分别比PA6/PP-g-MAH共混体系提高了24%和25.1%。     

尼龙12/OMMT纳米复合粉末的制备及性能

利用十八烷基三甲基溴化铵(OTAB)对蒙脱土(MMT)进行有机改性,并通过溶液插层法制备尼龙12/有机蒙脱土(PA12/OMMT)纳米复合粉末。利用X射线衍射、傅立叶变换红外光谱、扫描电子显微镜等手段对改性后的MMT及PA12/OMMT纳米复合粉末的结构和微观形貌进行表征,并将复合粉末热压成型制成标准件,测试其力学性能和热性能。结果表明,经过有机改性,MMT的层间距由1.24 nm增加到了2.13 nm,且改性后的MMT能均匀地分散在PA12基体中,PA12/OMMT纳米复合粉末的成型件在拉伸强度、弯曲强度、冲击强度和热性能方面都优于纯PA12粉末。PA12/OMMT纳米复合粉末为选择性激光烧结技术(SLS)提供了一种性能良好的粉末材料。     

OMMT/NR纳米复合材料的性能研究

采用两种有机蒙脱土(OMMT)通过机械混炼法制备OMMT/NR纳米复合材科,并对复合材料的各项性能进行研究.结果表明,与NR相比,OMMT/NR纳米复合材料的加工性能、物理性能、热稳定性能和动态力学性能均有明显改善;以N,N'-二甲基-烷烃铵盐作为蒙脱土改性剂制备的OMMT/NR纳米复合材料的加工性能和物理性能较好.     

Effect of clay modification on the morphological,mechanical, and thermal properties of polyamide 6/polypropylene/montmorillonite nanocomposites

Polyamide 6/polypropylene (PA6/PP = 70/30 parts) blends containing 4 phr (parts per hundred resin) of organophilic montmorillonite (OMMT) were prepared by melt compounding. The sodium montmorillonite (Na‐MMT) was modified using three different types of alkyl ammonium salts, namely dodecylamine, 12‐aminolauric acid, and stearylamine. The effect of clay modification on the morphological and mechanical properties of PA6/PP nanocomposites was investigated using x‐ray diffraction (XRD), transmission electron microscopy (TEM), tensile, flexural, and impact tests. The thermal properties of PA6/PP nanocomposites were characterized using thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and heat distortion temperature (HDT). XRD and TEM results indicated the formation of exfoliated structure for the PA6/PP nanocomposites prepared using stearylamine modified montmorillonite. On the other hand, a mixture of intercalated and exfoliated structures was found for the PA6/PP nanocomposites prepared using 12‐aminolauric acid and dodecylamine modified montmorillonite. Incorporation of OMMT increased the stiffness but decreased the ductility and toughness of PA6/PP blend. The PA6/PP nanocomposite containing stearylamine modified montmorillonite showed the highest tensile, flexural, and thermal properties among all nanocomposites. This could be attributed to better exfoliated structure in the PA6/PP nanocomposite containing stearylamine modified montmorillonite. The storage modulus and HDT of PA6/PP blend were increased significantly with the incorporation of both Na‐MMT and OMMT. The highest value in both storage modulus and HDT was found in the PA6/PP nanocomposite containing stearylamine modified montmorillonite due to its better exfoliated structure. POLYM. COMPOS., 31:1156–1167, 2010. © 2009 Society of Plastics Engineers     

原位插层聚合PA6/OMMT纳米复合材料的性能

以自行合成的NJ—1型插层剂对蒙托土(MMT)进行改性,并以X射线衍射、傅立叶变换红外光谱及热重分析表征了改性蒙脱土(OMMT)的性能。采用单体熔体插层—原位本体聚合的方法,制备了PA6／OMMT纳米复合材料,测定了该材料的热稳定性及力学性能。结果表明,含1．2％OMMT的PA6／OMMT纳米复合材料的拉伸强度、弯曲强度及弯曲弹性模量较PA6分别提高14％、16．2％及38．1％,断裂伸长率及冲击强度则分别下降了37．7％及4．5％。     

机械混炼法制备氟橡胶/有机蒙脱土纳米复合材料的结构与性能

选择实验室自制的3种有机蒙脱土，采用双辊混炼法制备了氟橡胶／有机蒙脱土复合材料。力学性能测试结果表明，氟橡胶／2^#有机蒙脱土复合材料具有优异的力学性能。研究了复合材料的微观结构及其应力应变行为、动态力学性能和热稳定性能。结果表明，实验制备出了一种插层型纳米复合材料；该复合材料具有较小的滚动阻力和优异的热稳定性能。     

Phase morphology evolution and compatibilization of immiscible polyamide 6/polystyrene blends using nano‐montmorillonite

Nanocomposites of organic nano‐montmorillonite (nano‐OMMT)‐filled immiscible polyamide 6 (PA6)/polystyrene (PS) blends were prepared by three different processing methods. Masterbatch M1 of OMMT/PA6 and masterbatch M2 of OMMT/PS were prepared as separate masterbatchs by melt mixing with PA6 or PS, and then either mixed together or each mixed individually with appropriate amounts of PS or PA6, respectively. The effects of nano‐OMMT content and processing method on the structure, phase morphology, and mechanical properties of the PA6/PS/OMMT nanocomposites were investigated by X‐ray diffraction, transmission electron microscopy, scanning electron microscopy, and mechanical properties tests. The results showed that the nano‐OMMT by M1 and M2 masterbatches dispersed primarily as exfoliated platelets in the PA6 matrix in the final composites regardless of the method of preparation. A drastic decrease of dispersed PS phase size and a very homogeneous size distribution were observed with the addition of nano‐OMMT. The PA6/PS/OMMT nanocomposites prepared from the M2 displayed the smallest dispersed PS phase size and best distribution of OMMT. The improvement of the mechanical properties of the PA6/PS/OMMT nanocomposites was attributed to the enhanced compatibilization of the immiscible PA6/PS blends by using nano‐OMMT. POLYM. ENG. SCI., 2017. © 2017 Society of Plastics Engineers     

丁腈橡胶/有机蒙脱土纳米复合材料的结构及性能研究

通过机械共混法制备了丁腈橡胶/有机蒙脱土（NBR/OMMT）纳米复合材料。运用X射线衍射（XRD）和透射电镜（TEM）表征了复合材料的纳米结构。通过硫化仪研究了有机蒙脱土用量对复合材料硫化性能的影响,同时研究了复合材料的力学性能、热空气老化性、耐油性和热稳定性。结果表明：有机蒙脱土的加入在一定程度上提高了复合材料的力学性能、热空气老化性、耐油性及热稳定性,而且对复合材料的硫化性能有明显的影响。     

Synthesis of exfoliated polyamide 6,6/organically modified montmorillonite nanocomposites by in situ interfacial polymerization

Polyamide 6,6 (PA 6,6)/organically modified montmorillonite (OMMT) nanocomposites were prepared by a novel method, using direct interfacial polymerization of an aqueous hexamethylene diamine and a nonaqueous adipoyl chloride in dichloromethane solution containing different amounts of OMMT dispersed nanoparticles. The state of dispersion of OMMT in the PA 6,6 matrix was investigated by means of X‐ray diffraction, as well as transmission electronic microscopy. The results indicated that the OMMT nanoparticles were dispersed homogeneously and nearly exfoliated in the PA 6,6 matrix. The random arrangement of clay platelets in the PA 6,6 matrix, exfoliation, and intercalation of clays between the PA 6,6 matrix were distinguished. The amount of the incorporated OMMT in the PA 6,6 matrix was determined by means of TGA technique. Furthermore it was found that addition of a small amount of OMMT dramatically improved the thermal stability of PA 6,6. The TGA thermograms of all the synthesized nanocomposite samples showed an interesting unexpected lag in the weight loss at high temperatures, which could be another evidence for formation of fully exfoliated nanocomposites structures, with improved thermal stability. Nucleating effect of the OMMT nanoparticles and their influence on crystallization behavior of PA 6,6 was confirmed by DSC. Finally it is concluded that the in situ interfacial polycondensation is a suitable method for synthesis of nanocomposites with well dispersed structures and enhanced properties. POLYM. COMPOS., 28:733–738, 2007. © 2007 Society of Plastics Engineers     

溴化丁基橡胶/天然橡胶/有机蒙脱土纳米复合材料的结构与性能研究

采用机械混炼法制备了溴化丁基橡胶/天然橡胶/有机蒙脱土(BIIR/NR/OMMT)纳米复合材料,对其亚微观结构与性能进行了表征。实验结果表明:OMMT片层以剥离形式均匀分散于橡胶基体中;OMMT能够明显促进橡胶硫化反应,并使BIIR和NR两相的交联同步性加强;纳米复合材料具有优异的物理机械性能和热稳定性能。     

OMMT与MPP协效阻燃对硅橡胶性能影响

以三聚氰胺磷酸盐（MPP）、有机蒙脱土（OMMT）为协效阻燃剂制备阻燃硅橡胶。通过x射线衍射（XRD）法、垂直燃烧法、热重法（TG）等研究阻燃硅橡胶分散性、燃烧性能和拉伸性能。结果表明,OMMT与MPP具有明显协同阻燃性;当OMMT用量为3质量份、MPP用量为55质量份时,复合材料有焰燃烧时间最短,阻燃效果最好;OMMT用量为3-5质量份时,复合体系的垂直燃烧性能均可达到FV-0级,残碳率最高,且力学性能较好。