共查询到20条相似文献,搜索用时 289 毫秒
1.
2.
3.
4.
原位接枝改性对白炭黑补强NR橡胶结构与性能的影响 总被引:1,自引:0,他引:1
研究了原位接枝改性白炭黑补强的天然橡胶力学性能及动态性能,采用红外光谱、热失重、转矩流变仪分别对改性前后的橡胶结构进行了表征。结果表明,白炭黑填充的天然橡胶经原位接枝改性后,拉伸强度和定伸应力均提高,压缩永久变形和阻尼因子(tanδ)均减小;当改性剂用量为9份时,胶料综合性能最好。TG分析及红外光谱分析结果表明,改性剂在混炼阶段与橡胶、炭黑粒子发生了接枝反应,在硫化阶段参与了交联反应。转矩流变仪测试结果表明,改性剂在混炼阶段需要达到一定的温度(约在120℃左右)才能与白炭黑发生接枝反应,且反应为吸热反应。 相似文献
5.
6.
炭黑是工业应用最早的纳米粉体材料。自从第一次世界大战期间作为橡胶补强填料以来,炭黑一直广泛应用于世界橡胶工业。因为其无法比拟的补强效果,其在橡胶工业中的地位是不可代替的。然而,目前商业炭黑还存在着一些问题,如:还有待进一步降低其滚动阻力、提高其抗湿滑性等。为解决这些问题,国外开发了低滞后炭黑和转化炭黑,但其力学性能受到一定影响。在炭黑改性方面,科学家们也做了大量的研究,因其多为液相中的改性,成本比较高,不适宜扩大规模。本文作者曾提出“乙烯基单体原位固态接枝改性炭黑的方法”,并报道了马来酸酐改性炭黑、丙烯酸丁… 相似文献
7.
8.
淀粉作为补强填料替代部分炭黑或白炭黑可以改善橡胶轮胎的抗湿滑性和滚动阻力,且淀粉来源广,成本低,无污染,有望成为新型橡胶补强填料。但淀粉极性强,与橡胶相容性差,直接使用无法起到补强效果。本文综述了淀粉细微化、酯化改性、接枝改性、原位改性这四种改性淀粉的方法。这些方法通过减小淀粉颗粒尺寸和引入其他分子链或基团等途径,改善淀粉在橡胶中的分散性及其与橡胶的相容性,使淀粉能够成为橡胶轮胎的优质补强填料。 相似文献
9.
10.
11.
炭黑表面接枝聚合改性进展 总被引:3,自引:0,他引:3
从炭黑粒子表面性质及表面化学基团出发 ,并结合聚合反应理论 ,介绍了将单体接枝聚合或将聚合物直接接枝到炭黑表面的自由基接枝、正离子接枝、负离子接枝及其他功能化接枝改性方法。论述了实现这些过程的溶液法、熔融法及辐射法接枝等工艺方法及影响炭黑接枝改性的因素。炭黑表面接枝聚合改性能大大扩大炭黑的应用范围。 相似文献
12.
Summary The grafted carbon black (GCB) was prepared by in-situ grafting low molecular weight compound on the surface of carbon black (CB) using a new technique. Poly(ethylene terephthalate)/grafted
carbon black (PET/GCB) and poly(ethylene terephthalate)/ carbon black (PET/CB) composites were prepared by melt blending.
The non-isothermal crystallization process of virgin Poly(ethylene terephthalate)(PET), PET/CB, and PET/GCB composites were
investigated by differential scanning calorimetry (DSC), and the non-isothermal crystallization kinetics was analyzed using
different approaches, i.e. modified Avrami equation, Ozawa equation and the method developed by Liu. The effective energy
barrier ΔE of virgin PET, PET/CB, and PET/GCB composites were calculated using the differential iso-conversional method. All
of the results showed that GCB and CB acted as nucleating agents and increased the crystallization rate of PET. Compared with
CB, GCB was a more effective nucleator for PET. 相似文献
13.
炭黑粒子表面功能化及其应用 总被引:2,自引:0,他引:2
罗延龄 《现代塑料加工应用》2001,13(6):37-41
从炭黑粒子表面性质及表面化学基团观点出发,介绍了将功能聚合物引入到炭黑表面,并用以制备热敏、气/湿敏传感器的研究现状及前景展望。 相似文献
14.
Summary To modify carbon black (CB) surface, in situ grafting of natural rubber (NR) onto the CB surface by solid-state method was used to get grafted carbon black (GCB). The
vulcanization characters of NR compounds employed CB and GCB were investigated. Crosslinking density of vulcanized NR was
measured by equilibrium swelling method. As a result, it was found that GCB could improve both cure rate and crosslinking
density. Moreover, the mechanical properties of vulcanized NR filled with GCB were enhanced to a large extent compared with
vulcanized NR filled with CB. No Payne Effect was observed in GCB filled NR compounds during dynamic properties testing, indicating
that there was no filler network and GCB was dispersed uniformly in NR matrix, which was proved by SEM micrographs. Based
on above results, it was considered that the grafting modification weakened filler-filler interaction and enhanced filler-polymer
interaction. 相似文献
15.
Xingbo Zhao Junwei Gu Dezhong Yin Changjie Yin 《Polymer-Plastics Technology and Engineering》2013,52(15):1507-1510
Hydrogenated nitrile rubber (HNBR) filled with carbon black (CB) and in-situ prepared zinc dimethacrylate (ZDMA) was prepared by mechanical mixing method. The effects of carbon black on the vulcanization characteristics, physical and dynamic mechanical properties, thermal stability and the fracture surface morphologies of HNBR reinforced by in-situ prepared ZDMA (HNBR/ZDMA) were investigated. The results showed that, for given ZDMA loading (50 phr), with the increasing CB content, the scorch time extended, tensile strength, tear strength and elongation at break increased at first and then decreased, while the modulus at 100% and hardness increased. The comprehensive properties of the HNBR/ZDMA/CB was optimal, when the content of CB was 10 phr. DMA analysis showed that the addition of CB could enhance the storage modulus (E’) & loss modulus (E”), and decreased the glass transition temperature (Tg) of HNBR/ZDMA. TGA analysis revealed that the addition of CB could improve the thermal stability of HNBR/ZDMA. SEM analysis showed that the CB dispersed well in the HNBR/ZDMA, and the CB could improve the dispersion of ZDMA effectively. 相似文献
16.
接枝炭黑/聚乙烯导电复合材料正电阻温度系数(PTC)效应研究 总被引:1,自引:0,他引:1
用接枝炭黑作导电粒子研究了在聚乙烯基材中的正 (电阻 )温度系数 (PTC)效应。结果发现 ,甲基丙烯酸甲酯接枝的炭黑在高密度聚乙烯中能表现出较好的 PTC效应。从实验现象分析 ,接枝炭黑的 PTC效应是结晶熔融和体积膨胀双重变化共同作用的结果。 相似文献
17.
通过对导电填料炭黑(CB)进行官能化,在CB表面引入羧基官能团,利用CB表面的羧基等活性官能团与端异氰酸酯基聚氨酯预聚物反应得炭黑接枝水性聚氨酯(CB-g-WPU),采用乳液共混法制备得CB—g-WPU/WPU气敏导电复合材料,并对CB—g-WPU/WPU复合材料的气敏响应行为进行了研究。X射线光电能谱(XPS)、傅立叶变换红外光谱(FTIR)、热重分析(TGA)等分析结果表明聚氨酯接枝到了炭黑表面;SEM分析表明,炭黑经过接枝改性后均匀分散在基体WPU中。该法制备的CB—g-WPU/WPU复合材料逾渗值低、气敏响应度大、响应范围广,是一种综合性能优异的气敏导电复合材料。 相似文献
18.
19.
20.
炭黑粒子偶联处理的HDPE复合材料PTC性能研究 总被引:1,自引:0,他引:1
研究了以HDPE为基体,工业炭黑(CB)为导电粒子的高分子复合材料的PTC(正温度系数)导电行为。考察了炭黑及偶联剂种类、用量对高分子PTC导电材料性能的影响,并探讨了偶联接枝机理,从理论上对改性效果进行了分析。结果表明,对炭黑,尤其是槽法炭黑 表面处理可显著提高复合材料的电导率及减小NTC(负温度系数)效应;钛酸酯偶联剂具有最佳改性效果,可明显改善炭黑粒子分散状态,增强材料的PTC效应,其最佳用量为1%质量份。 相似文献