机械共混法制备丁腈橡胶/聚氯乙烯/有机蒙脱土纳米复合材料的结构及性能

用机械共混法将4种牌号的有机蒙脱土(OMMT)与丁腈橡胶(NBR)/聚氯乙烯(PVC)共混,制备了纳米复合材料,并对其微观结构、硫化特性、力学性能以及耐油性进行了考察.结果表明,该复合材料具有插层型结构;4种牌号的OMMT均能提高共混胶的硫化速率,且能提高纳米复合材料的力学性能,其中牌号为FMR 11的OMMT增强效果最好,当其用量为6份时,纳米复合材料的拉伸强度比纯胶提高了49.96%,撕裂强度提高了36.9%,扯断伸长率也有所提高;随着OMMT用量的增加,纳米复合材料的耐油性逐渐提高.     

BIIR/EPDM/OMMT纳米复合材料的结构与性能研究

选择实验室自制有机蒙脱土(OMMT),采用机械共混法制备了溴化丁基橡胶/三元乙丙橡胶/OMMT(BIIR/EPDM/OMMT)纳米复合材料。利用X射线衍射分析(XRD)和扫描电子显微镜分析(SEM)考察了复合材料的亚微观结构,表明成功制备出了BIIR/EPDM/OMMT纳米复合材料;不同OMMT含量的复合材料的力学性能测试结果表明:当OMMT用量为5份时,拉伸强度和撕裂强度分别提高了44%和43%;另外对纳米复合材料的硫化特性及表观交联密度进行了对比分析。     

BR/炭黑/OMMT纳米复合材料的制备与性能研究

采用溶液插层法与两辊混炼法制备BR/炭黑/有机蒙脱土(OMMT)纳米复合材料,并对其微观结构和性能进行研究.结果表明,BR/炭黑/OMMT复合材料为插层型纳米复合材料,采用OMMT等量替代炭黑可明显降低胶料的门尼粘度,改善加工性能,提高胶料的硫化速度;OMMT用量不大于4份时可显著增大复合材料的拉伸强度、拉断伸长率和撕裂强度.     

NBR/CR/OMMT纳米复合材料的结构与性能研究

采用机械混炼法制备了丁腈橡胶/氯丁橡胶/有机蒙脱土(NBR/CR/OMMT)纳米复合材料,并对其亚微观结构与性能进行了研究。透射电子显微镜(TEM)观察表明,OMMT以纳米尺寸分散于橡胶基体中,它与橡胶基体具有良好的相容性;OMMT能够明显提高纳米复合材料的表观交联密度;纳米复合材料具有优异的力学性能;与纯NBR/CR共混胶相比,纳米复合材料具有相同的起始分解温度和更高的最快失重温度。     

溴化丁基橡胶/有机蒙脱土纳米复合材料的制备和性能研究

用机械共混法制备了剥离型溴化丁基橡胶/有机蒙脱土(BIIR/OMMT)纳米复合材料。OMMT可使溴化丁基橡胶的正硫化时间缩短,却不影响焦烧安全性,达到了节能降耗的目的。OMMT的加入还可使耐溶剂性能和耐热性能显著提高,其含量仅为3.0 phr时,拉伸强度和撕裂强度分别提高了90.8%和81.4%。     

机械共混法制备NR/SBR/OMMT纳米复合材料及其性能

选择不同牌号的有机蒙脱土（OMMT）,利用机械共混法制备了NR/SBR/OMMT纳米复合材料。测试了复合材料的力学性能,选择出了最佳牌号OMMT。不同含量的OMMT与共混胶复合后力学性能的测试结果表明：当OMMT含量仅为3份时,拉伸强度和断裂强度分别提高了90％和63%;利用X射线衍射和透射电子显微镜研究了复合材料的亚微观结构,观察结果显示制备出了分散均匀的剥离型NR/SBR/OMMT纳米复合材料,同时OMMT在轮船工业配方中的优异性能预示其良好的应用前景。     

有机蒙脱土在冬季轮胎胎冠胶中的应用研究

采用机械混炼法制备了天然橡胶/溴化丁基橡胶/有机蒙脱土(NR/BiIR/OMMT)纳米复合材料,并对其亚微观结构与性能进行了研究.结果表明,NR/BIIR/OMMT复合材料为剥离型纳米复合材料,具有优异的力学性能;OMMT对NR/BIIR共混胶的耐寒性能影响较小,在制备冬季轮胎胎冠胶方面具有优异的工业应用前景.     

BSBBR/OMMT纳米复合材料的结构与性能

采用机械共混法分别制备了BSBBR(星形支化溴化丁基橡胶)/OMMT(有机蒙脱土)纳米复合材料、BIIR(溴化丁基橡胶)/OMMT纳米复合材料,并着重探讨了OMMT掺量对两者结构和性能的影响。研究结果表明:BSBBR、BIIR中的部分橡胶大分子链可插入至OMMT的片层结构中,并且OMMT可良好分散在BSBBR、BIIR基体中;当w(OMMT)=10%(相对于纳米复合材料质量而言)时,BSBBR/OMMT纳米复合材料的拉伸强度相对最优,并且比纯BSBBR提高了73%,而且是BIIR/OMMT纳米复合材料的1.35倍;与BIIR/OMMT纳米复合材料相比,BSBBR/OMMT纳米复合材料具有更优异的耐热性和气体阻隔性。     

有机蒙脱土/NR/NBR纳米复合材料的结构与性能研究

采用乳液法和机械共混法制备有机蒙脱土(OMMT)/NR/NBR复合材料,并对其微观结构、物理性能、动态力学性能和耐油性能进行研究.结果表明:大多数OMMT片层以纳米尺寸均匀分散在NR基体中;随着OMMT用量的增大,OMMT/NR/NBR复合材料物理性能和耐油性能提高;与NR /NBR并用胶相比,OMMT/NR/NBR纳米复合材料具有更低的滚动阻力.     

甲基乙烯基硅橡胶/有机蒙脱土母炼胶纳米复合材料的制备、结构与性能

采用溶液插层法和母炼胶混炼工艺制备了甲基乙烯基硅橡胶(MVQ)/有机蒙脱土母炼胶(OMMT-MB)纳米复合材料,通过X射线衍射(XRD)、透射电子显微镜(TEM)对复合材料进行了表征,研究了复合材料的拉伸性能与热稳定性能,并与直接共混法制备的MVQ/有机蒙脱土(OMMT)复合材料和MVQ/白炭黑复合材料进行了对比,分析了OMMT的增强机理.结果表明,MVQ/OMMT-MB纳米复合材料中的OMMT完全剥离,且均匀分散在MVQ基体中;当OMMT质量分数为20%时,MVQ/OMMT-MB复合材料的拉伸性能优于MVQ/OMMT复合材料,拉伸强度和扯断伸长率分别增大至1.41 MPa、490%;其与MVQ/白炭黑复合材料相比,两者的拉伸强度相当,扯断伸长率增大了30%;MVQ/OMMT-MB复合材料的热稳定性略优于MVQ/OMMT复合材料,但比MVQ/白炭黑复合材料差.     

乳液插层法制备丁苯橡胶/蒙脱土纳米复合材料的结构与性能

选用一种能够在水中分散良好的有机改性蒙脱土（OMMT），采用乳液插层法制备了SBR／OMMT纳米复合材料，X射线衍射和透射电镜观察显示制得了半剥离型与插层型共存的纳米复合材料。研究了复合材料的力学性能和耐溶剂性能。测试结果表明，随着蒙脱土用量的增加，复合材料的定伸应力、拉伸强度和撕裂强度均大幅度提高。复合材料具有优异的耐溶剂性能。     

A Study on Structure and Mechanical Properties of Polyurethane/Organic-Montmorillonite Nanocomposites

The intercalated nanocomposites of polyurethane (PU) with organic-montmorillonite (OMMT) treated by cetryltrimethyl ammonium bromide was prepared. The interlayer spacing of PU/OMMT nanocomposites was 3–4 nm. The interface interaction of PU/OMMT nanocomposites was improved compared to that of PU/montmorillonite (MMT) composites. The orderly arrangement of the PU chains was hindered because of strong interface interaction between the silicate layers dispersed in the nanometer and PU chains. By adding 2 wt% OMMT to PU, tensile strength and tear strength of the PU/OMMT composites were increased from 10.5 MPa and 36.4 KN/m to 13.8 MPa and 42.2 KN/m, respectively. The tensile strength and tear strength increased with OMMT content firstly, reaching its maximum when the OMMT content was 8 wt%. After that, the tensile strength and tear strength decreased with the further increase of the OMMT content. Compared to that of PU, the elongation at break of the PU/OMMT nanocomposites increased, indicating that the stretch of PU/OMMT nanocomposites increased.     

Structure and Property of PU/MMT Nanocomposites by In-Situ Polymerization

A montmorillonite modified by octadecylammonium salt (OMMT) was prepared. A polyurethane (PU)/montmorillonite nanocomposite was synthesized by in-situ polymerization using the OMMT, poly(propylene glycol), 4,4-diphenylmethylate diisocyanate, and 1,4-butanediol. The MMT platelets were dispersed in PU matrix on a 10 ～ 50 nm scale. Compared to that of pure PU, the tensile strength and tear strength of the PU/OMMT nanocomposites increased, respectively, and the MMT platelets dispersed on a nanometer scale enhanced the PU. The temperature of initial weight loss of the PU/OMMT nanocomposites was lower than that of pure PU because of the acid catalytic action of protonated MMT platelets in the first thermodegradation step. But its temperature of initial weight loss was higher than that of pure PU because of the barrier effect of the MMT platelets in the second thermodegradation step.     

NR／BR／OMMT纳米复合材料的研究（Ⅰ）复合材料的制备及表征

选用自制的3种有机蒙脱土（OMMT）。利用机械共混法制备了天然橡胶／顺丁橡胶／有机蒙脱土（NR／BR／OMMT）纳米复合材料,测试了复合材料的力学性能,研究了复合材料的耐老化和耐溶剂性能。结果表明：3种OMMT对复合材料的补强效果明显不同,其中2#OMMT为最佳．其断裂强度和撕裂强度均提高近1倍,耐老化和耐溶剂性能也最优异。     

Effect of exfoliated organophilic montmorillonite on the structure and conductivity of polypropylene/polyaniline composites

This study concentrates on the effect of organophilic montmorillonite (OMMT) nanolayers on conductivity, structure, morphology, and mechanical properties of the polypropylene/polyaniline (PP/PANI) composites. The composite was prepared by in situ polymerization of aniline at different composition ratios in the presence of PP powder. The structure and conductivity of ternary PP/PANI/OMMT nanocomposites were compared with those of PP/PANI composites. DC electrical conductivity measurements indicated that electrical conductivity decreased in the presence of OMMT layers. Scanning electron microscopy showed that the surface of ternary nanocomposites have more rough regions. The interaction between PANI and OMMT was confirmed by Fourier transform infrared spectroscopy. The distribution of OMMT layers in the polymer matrix, as an effective parameter on the properties of nanocomposite, was investigated and confirmed using X‐ray diffraction and transmission electron microscopy. The results showed an exfoliated array for OMMT layers in the nanocomposite structure. The shear storage modulus for PP/PANI composites was lower than that for pure PP; however, it was increased for PP/PANI/OMMT nanocomposites. The data from the tensile and izod impact strength showed that the Young's modulus and izod impact strength were increased slightly by the addition of OMMT, whereas the elongation at break was decreased. POLYM. COMPOS., 38:699–707, 2017. © 2015 Society of Plastics Engineers     

尼龙-6/蒙脱土的制备及用聚丁二烯改性的研究

以十六烷基三甲基溴化铵为有机插层剂对无机蒙脱土进行处理制备有机蒙脱土,采用原位聚合法制备尼龙-6/OMMT纳米复合材料,并在聚合过程中添加聚丁二烯合成PA-6/PB/OMMT纳米复合物.用FT-IR,XRD等对复合材料进行表征,并进行力学性能分析.实验表明,PB的加入能相对提高尼龙-6/OMMT的冲击强度,在PB含量为3%时,复合材料的拉伸性能和冲击性能较好.     

有机蒙脱土增强聚氯乙烯手套材料的制备与表征

通过在乳液聚氯乙烯（PVC）中添加有机蒙脱土（OMMT）来研究OMMT对其各项性能的影响。结果表明：OMMT对乳液PVC／邻苯二甲酸二辛酯（DOP）／OMMT纳米复合材料的力学性能有一定的改善效果;对复合材料的抗增塑剂迁移效果明显;在耐酸和耐碱试验中,未添加OMMT的复合材料的拉伸强度和撕裂强度分别降低了7．3％、5．i％和5．5％、13．3％,而添加3份OMMT后,仅仅降低了2．5％、2．6％和1．5％、4．2％,效果显著。     

Effect of ultrasonic extrusion on properties of colloids and bio-based nanocomposites containing epoxidized soybean oil and nanoclay

Colloid prepared with epoxidized soybean oil (ESO) and a nanoclay, organically modified montmorillonite (OMMT), has been processed using an ultrasonic twin-screw extruder under various ultrasonic amplitudes and screw rotation speeds. Ultrasonic treatment has significantly increased OMMT dispersion in ESO, according to wide angle X-ray diffraction and rheological data. Yield stress, storage and loss modulus, and complex viscosity and relaxation time of the colloid have been increased with increase of ultrasonic amplitude. Under certain high ultrasonic amplitudes, the increase of one to two orders of magnitude in the above-mentioned properties of colloids has been observed. Creep and recoverable compliance have been decreased with the increase of ultrasonic amplitude. The tremendous changes in rheological properties of the colloid are a result of significantly improved OMMT dispersion with the aid of ultrasonic treatment. With no or low ultrasonic treatment, a higher screw rotation speed has improved OMMT dispersion since it brings more mixing effect. However, at high ultrasonic amplitudes, a higher rotation disrupts jet flow and has led to less dispersion improvement compared with the same colloid extruded at a lower rotation speed. Colloids extruded at 400 rpm were cured using triethylenetetramine to prepare bio-based nanocomposites. The nanocomposite prepared using colloid treated at 13 μm shows improved tensile strength and modulus compared with the nanocomposite prepared using untreated colloid.