共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
5.
导电高聚物聚2,5-二甲基苯胺的化学合成与特性 总被引:2,自引:0,他引:2
报道了聚2,5-二甲基苯胺(PDMeAn)的化学合成,并用标准四探针方法测定其电导率,以FTIR、UV-Vis吸收光谱、元素分析和CV法对其性质进行了研究,PDMeAn的结构与聚苯胺和聚2,5-二甲氧基苯胺的结构类似,是由其单元通过氮原子(N)在对位上键合而成,本征态的PDMeAn能溶于多种有机溶剂,如CH2Cl2、CHCl3、DMSO、DMF等。 相似文献
6.
7.
采用二甲基硅氧烷-b-乙二醇嵌段共聚物(DMS-b-OE)对聚二甲基硅氧烷/聚氨酯(PDMS/PU)共混体系的增容,重点研究了增容共混体系的微观形态结构和软科学性能之间的关系。扫描电子显微镜、动态力学分析和力学性能测试结果表明:DMS-b-OE对PDMS/PU具有优良的增容作用,改善了PDMS/PU共混体系的相容性,提高了该共混物的力学性能。其抗张强度由3.4MPa提高到7.6MPa。 相似文献
8.
9.
10.
STUDYONTHESORPTIONBEHAVIOROFN-METHYL-2-THIO-IMIDAZOLERESINFORRh(Ⅲ)ANDSEPARATIONOFRh(Ⅲ)WITHCOMMONMETALIONSBYUSINGMTIRChenYiyon... 相似文献
11.
SAN共聚物组成对PVC/ABS共混物相容性的影响 总被引:5,自引:0,他引:5
采用乳液聚合技术通过改变共聚单体的投料比(St/AN)合成了一系列不同AN结合量的ABS接枝共聚物粉料和SAN共聚物.将其与聚氯乙烯(PVC)和邻苯二甲酸二辛酯(DOP)熔融共混分别制得了PVC/ABS、PVC/SAN、PVC/ABS/DOP和PVC/SAN/DOP共混物,利用SEM、TEM和动态力学粘弹谱仪(DMA)对共混物的相容性和相结构进行了表征.结果发现,在PVC/ABS共混体系中,尽管改变接枝SAN共聚物的AN结合量,PVC和SAN共聚物均为不相容体系;在该共混物中引入增塑剂DOP后,虽然当SAN共聚物AN结合量小于23.4 wt%时,共混物在室温以上只存在一个tanδ峰,但形态结构研究结果表明共混物仍为不相容体系,共混物的相区尺寸明显地依赖于SAN共聚物中的AN结合量,当AN结合量为23.4 wt%时相区尺寸最小. 相似文献
12.
用反相气相色谱法测定了聚氯乙烯(PVC)/ 乙烯-醋酸乙烯共聚物(EVA)共混体系中分子间表观热力学相互作用参数χ′23,并以χ′23 为判定依据,研究了共混物的相溶性。 初步探讨了共混物的组成、聚合物分子 链结 构、温度与χ′23的关系以及探针分子性质 对χ′23参数的影响。结果表明:χ[ HT6〗′23值能够准确有效地判定PVC与EVA共混物的 相溶性,醋酸乙烯质量分数低的EVA与PVC的共混物是热力学不相溶的;而醋酸乙烯质量 分数中等的EVA与PVC的共混物则具有部分相溶性。结果与其它方法得到的结论是一致的 。 相似文献
13.
Specific interactions in binary blends of poly(vinyl chloride) (PVC) with ethylene–vinyl acetate copolymers (EVA) and ethylene-methyl acrylate copolymers (EMA) were investigated by observation of band shifts of the carbonyl absorption using ATR-FTIR spectroscopy at variable temperature. Blends of PVC with EVA and EMA could be prepared as heterogeneous, homogeneous or metastable homogeneous mixtures, depending on the copolymer composition. The miscible systems as well as the heterogeneous ones showed only very small or no band shifts. The metastable blends exhibited shifts of several wave numbers to lower values, which vanished at higher temperatures as the blends demixed. Strong interactions in the metastable blends could be related to good impact properties of the corresponding two-phase systems. 相似文献
14.
Graft copolymers have a potential as compatibilizers in two-component thermoplastic polymer blends, and also as impact-modifiers in one-component thermoplastics. The compatibility of the blocks of the copolymer (i.e. the grafts and the main chain) with the chains of the matrix polymers must be adjusted carefully. Blends of various polymers, especially of polystyrene (PS) and poly(vinyl chloride) (PVC), with graft copolymers on the basis of polybutadiene are discussed. An excellent compatibilizer, for blends PS/PVC, is a block-graft copolymer, derived from a diblock copolymer of Styrene and butadiene, with grafts of cyclohexyl methacrylate monomelic units. 相似文献
15.
Binary blends of poly(vinyl chloride) (PVC) and chitin-graft-poly(2-methyl-2-oxazoline) showed miscibility in the blend fraction range of the latter lower than ca. 10 wt.-%. The glass transition temperature of PVC, which was determined by differential scanning calorimetry, changed to lower temperatures with increasing modified chitin contents up to 10 wt.-%. Segmental interaction between PVC and the graft copolymer was confirmed by the carbonyl stretching band shift in the FT-IR analysis. 相似文献
16.
17.
The core-shell structured grafted copolymer particles of polybutadiene grafted polymethyl methacrylate (PB-g-PMMA, MB) were prepared by emulsion polymerization. The MB particles were used to modify poly (vinyl chloride) (PVC) by melt blending. The mechanical properties of the PVC blends were investigated. The micro-morphology of the PVC blends was observed by scanning electron microscopy (SEM). The results indicated that the samples with the best impact strength could be obtained when the core-shell weight ratio of PB to PMMA is lower than 93:7, the mechanical properties correlated well with SEM morphologies, the addition of modifier with the ratio core to shell of 93:7 could reduce the domain size of the dispersed phase. Furthermore, the compatibility and properties of the blends were greatly enhanced and improved. The modifier particles could be well dispersed in the PVC matrix. 相似文献
18.
M. N. Radhakrishnan Nair M. R. Gopinathan Nair 《Journal of Thermal Analysis and Calorimetry》2011,103(3):863-872
Thermal stability of solution-cast blends of poly(vinylchloride) and NR-b-PU block copolymers of three different chain extender
diols was studied by thermogravimetry. Thermal degradation of individual components and their blends were investigated with
special reference to blend ratio. As the block copolymer content in the blends increased their thermal stability was also
found to increase. Enhanced thermal stability of PVC is believed due to the favorable interaction with PVC and the PU hard
segments of the block copolymer. DTG curves were used for the determination of different stages involved in the degradation.
Activation energy for degradation was determined from Coats–Redfern plot. 相似文献
19.
The miscibility and phase behavior in blends of PVC with poly(methyl-co-hexyl acrylate)[MHA] and poly(methyl-co-2 ethyl hexyl acrylate)[MEH] were studied. It was found that PVC is miscible with MHA copolymers having a HA volume fraction from 0.30 to 0.92 and MEH copolymers having an EH volume fraction from 0.30 to 0.83 at 100°C. By applying the mean field theory to the phase diagrams of these blend systems, segmental interaction parameters which represent the binary interaction between different monomer units were estimated. The calculated values reflect the fact that the miscibility window observed for PVC/MHA and PVC/MEH blend systems was attributed to the effect of repulsion between different monomer units within the copolymer. To investigate the effect of specific interaction on the miscibility for these blend systems, an attempt was also made to describe the blend interaction parameter as a function of polar group concentration in the acrylate copolymer. The blend interaction parameter values exhibit a u-shaped curve as a function of the weight fraction of C?O group in the copolymer, and the lowest blend interaction parameter value appears at about 0.24 C?O weight fraction. 相似文献
20.
Normalized dielectric loss curves for blends of PVC with an EVA copolymer containing 70% vinyl acetate showed significant broadening with increasing PVC content. In conjunction with phase separation studies it was concluded that increasing loss curve broadness correlated with increasing tendency toward phase separation. Calculation of correlation parameters for the blends revealed differences in intermolecular correlations with blend composition. 相似文献