共查询到20条相似文献,搜索用时 406 毫秒
1.
PVC/粘土纳米复合材料的研究进展 总被引:6,自引:0,他引:6
概述了PVC/粘土纳米复合材料的研究及发展现状,总结了离子交换、偶联剂处理、接枝改性等粘土的表面处理方法及直接熔融插层、原位插层聚合、共混等PVC/粘土纳米复合材料的制备方法,并分析了PVC/粘土纳米复合材料的性能及其发展前景。 相似文献
2.
开环聚合酚醛树脂基复合材料的研究:MDAPF1—EGF玻璃布层压板的研制 总被引:13,自引:0,他引:13
采用含环状结构苯并恶嗪的中间体与环氧树脂共混,加入适量催化剂,通过开环聚合,制得一种新型酚醛树脂基玻璃布层压板(MDAPF1-EGF),并用凝胶化时间、DTA、TBA等方法研究了树脂的固化行为,讨论了催化剂用量的影响,确定了较为合理的工艺条件。性能测试表明,由TGA求得的固化树脂的耐热温度为210℃;玻璃布层压板在180℃的弯曲强度为270MPa,适用于耐高温结构材料。 相似文献
3.
4.
5.
介绍了聚乳酸/层状硅酸盐纳米复合材料研究进展,阐述了其制备方法如原位聚合插层法、溶液插层法、熔融插层法等,详述了聚乳酸添加纳米层状硅酸盐后结构与性能的变化,包括复合材料的微观结构、结晶性能、热性能、力学性能、流变性能、加工性能、阻隔性能、阻燃性能的变化。研究表明,采用不同的制备方法如原位聚合插层法、溶液插层法、熔融插层法等能制得插层型、剥离型以及插层与剥离混合型聚乳酸/层状硅酸盐纳米复合材料;添加纳米层状硅酸盐后,得到的聚乳酸/层状硅酸盐纳米复合材料结晶速率提高,结晶度增加,说明层状硅酸盐起到了成核剂的作用;热稳定性、拉伸模量和冲击强度、阻透性能和阻燃性能都有不同程度提高;流变性能也得到改善。 相似文献
6.
7.
8.
9.
10.
11.
12.
The polymerization kinetics and thermal properties of dicyanate/clay nanocomposites were investigated. A type of organically modified clay was used as nanometer‐size fillers for the thermosetting dicyanate resin. Differential scanning calorimetry (DSC) was used to study the curing behavior of the dicyanate/clay nanocomposite systems. The polymerization rate of the nanocomposite systems increased with increasing clay content. An autocatalytic reaction mechanism could adequately describe the polymerization kinetics of the dicyanate/clay nanocomposite systems. The polymerization kinetic parameters were determined by fitting the DSC conversion data to the proposed kinetic equation. The glass‐transition temperature of the dicyanate/clay nanocomposites increased with increasing clay content. The thermal decomposition behavior of the dicyanate/clay nanocomposites was investigated by thermogravimetric analysis. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1955–1960, 2004 相似文献
13.
14.
C. Berti E. Binassi M. Colonna M. Fiorini T. Zuccheri S. Karanam D. J. Brunelle 《应用聚合物科学杂志》2009,114(5):3211-3217
Poly(butylene terephthalate) nanocomposites with organically modified montmorillonites have been prepared by in‐situ ring opening polymerization of PBT cyclic oligomers. High molecular weight polymers can be obtained by choosing the proper polymerization conditions and catalyst in very short polymerization time (10 min) and low temperature (205°C). A better dispersion of the clay and a consistently higher Mw have been obtained by this method respect to the standard melt intercalation approach, leading to improved thermo‐mechanical properties of the nanocomposite. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
15.
Christian Decker 《Polymer》2005,46(17):6640-6648
Clay-based nanocomposite polymers have been synthesized by photoinitiated crosslinking polymerization of acrylate and epoxy functionalized oligomers. The solvent-free resin containing a small amount (3 wt%) of organophilic clay was cured within seconds upon UV irradiation at ambient temperature. The polymerization reaction was followed by infrared spectroscopy and shown to proceed at a great extent in thick samples (2 mm), due to the higher exotherm and the resulting rise in temperature. The organoclay was shown to have no slowing down effect on the photopolymerization of both acrylate and epoxy resins. The addition of clay nanoparticles was found to reduce the gloss of UV-cured coatings due to an enhanced surface roughness. The viscoelastic and tensile properties of the nanocomposite photopolymer were comparable to those of the neat UV-cured polymer, while their resistance to moisture was significantly increased. 相似文献
16.
Layered‐silicate‐based polymer–clay nanocomposite materials were prepared depending on the surface modification of montmorillonite (MMT). Nanocomposites consisting of poly(butylene terephthalate) (PBT) as a matrix and dispersed inorganic clay modified with cetyl pyridinium chloride (CPC), benzyl dimethyl N‐hexadecyl ammonium chloride, and hexadecyl trimethyl ammonium bromide by direct melt intercalation were studied. The organoclay loading was varied from 1 to 5 wt %. The organoclays were characterized with X‐ray diffraction (XRD) to compute the crystallographic spacing and with thermogravimetric analysis to study the thermal stability. Detailed investigations of the mechanical and thermal properties as well as a dispersion study by XRD of the PBT/clay nanocomposites were conducted. X‐ray scattering showed that the layers of organoclay were intercalated with intercalating agents. According to the results of a differential scanning calorimetry analysis, clay acted as a nucleating agent, affecting the crystallization. The PBT nanocomposites containing clay treated with CPC showed good mechanical properties because of intercalation into the polymer matrix. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
17.
Sinan en 《Polymer Composites》2010,31(3):482-490
Unsaturated polyester (UPE) resin including styrene monomer was mixed with organophilic montmorillonite (MMT) clay and its crosslinking polymerization reaction was done in the presence of free‐radical initiator. MMT clay was modified with cetyl trimethly ammonium bromide and trimethoxy vinyl silane. The nanocomposites were characterized by X‐ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), thermogravimetric and dynamic mechanical analyses (TGA and DMA). The exfoliated nanocomposite structure was obtained when the MMT clay was modified in the presence of both modifiers, whereas individual modifications all resulted in intercalated structures. The exfoliated UPE nanocomposite exhibited better thermal and dynamic mechanical properties when compared with pure UPE and other composites, even with 3 wt% clay loading. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers 相似文献
18.
An in situ intercalative polymerization method for preparing UV curable clay–polymer nanocomposites 下载免费PDF全文
A novel in situ intercalative polymerization technique was used to disperse clay mineral in a precursor resin for use in UV curing by performing an in situ ion exchange reaction during polyesterification. Unmodified montmorillonite (MMT) was added to a reaction mixture composed of monomers and methyl, tallow, bis‐2‐hydroxyethyl ammonium (MTEtOH) during the synthesis of unsaturated polyesters to create resins containing highly dispersed, organically modified MMT. UV‐curable clay–polymer nanocomposite (CPN) films were then prepared utilizing donor–acceptor chemistry through reactions of the unsaturated polyester resin with triethylene glycol divinyl ether. Functional group conversion improved up to 15% by the incorporation of clay mineral into the polymer matrix through the in situ polymerization method. The CPNs also had improved barrier, mechanical, and thermal properties over a control film containing no clay mineral. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42601. 相似文献
19.
Summary The nanocomposites with poly(butylene terephthalate)(PBT)
incorporated between the montmorillonite (MMT) layers were
synthesized from dimethyl terephthalate (DMT) and butane diol
(BD) by using an in-situ interlayer polymerization approach. The
PBT nanocomposites were melt spun at different organoclay
contents to produce monofilaments. The existence of clay layers
in the PBT was confirmed by using X-ray diffraction and
transmission electron microscopy, and those layers were found to
be disperse on a nanometer scale. The thermal properties of the
layered structures of the hybrids were found to be more stable
than those of pure PBT. These improved thermal properties of the
nanocomposites might arise from an extensive and strongly bonded
interface between the organic and the inorganic components.
Moreover, the addition of only a small amount of organoclay was
enough to improve the mechanical properties of the PBT hybrid
fibers. 相似文献
20.
PE/Clay Nanocomposite with Bimodal Molecular Weight Distribution Produced Via In-Situ Polymerization
Sadegh Abedi Majid Abdouss Majid Daftari-Besheli Ali Moghimi Seyed Mehdi Ghafelehbashi Mohammad Ali Pourian 《Journal of Inorganic and Organometallic Polymers and Materials》2014,24(2):416-423
A Ti-based Ziegler–Natta catalyst supported on the clay was used for producing the polyethylene/clay nanocomposites through in situ polymerization. This catalyst showed high activity in the ethylene polymerization. The two-step polymerization approach, i.e. in the presence and absence of hydrogen, was laid out to broaden the molecular weight distribution of the polyethylene/clay nanocomposite. The molecular weights and molecular weight distribution of the nanocomposites were characterized by the gel permeation chromatography. It was found that the molecular weight distribution was remarkably widened towards bimodal distribution by using the above mentioned approach. The thermal properties of the produced nanocomposites were studied by differential scanning calorimetry and thermal gravimetric analysis. The microstructure of the resulting bimodal polyethylene/clay nanocomposite was investigated by X-ray diffraction and transmission electron microscopy. The thermal gravimetric analysis indicated an improved thermal stability of the produced nanocomposites. In addition, the studies proved the nanocomposite formation with the exfoliated structure of the clay in the polyethylene matrix. 相似文献