共查询到19条相似文献,搜索用时 139 毫秒
1.
2.
《化学研究与应用》2015,(12)
通过将环氧醚和甲基醚分别加到含氢硅油的基本骨架上,合成环氧醚甲基醚共改性硅油中间体。通过环氧氯丙烷和正二丁胺亲核加成反应得到聚-2-羟基丙基二丁基氯化铵,与有机交联剂多乙烯多胺交联得到聚季铵盐。再将共改性硅油与聚季铵盐进行环氧开环反应,得到聚醚聚季铵盐水包油型反相破乳剂。利用FTIR和1H NMR分析了聚醚季铵盐型水包油型反相破乳剂的结构,考察了破乳条件对破乳性能的影响。实验结果表明,在适宜的破乳条件(破乳剂用量100 mg/L、破乳时间4 h、破乳温度为65℃)下,使用聚醚季铵盐型水包油型反相破乳剂的除油率94.9%,破乳后污水含油量为25.8 mg/L,破乳性能优于聚醚季铵盐破乳剂。 相似文献
3.
4.
5.
6.
7.
在锐钛型钛溶胶颗粒或粉体TiO2存在下,进行端乙烯基硅油与含氢硅油的原位硅氢加成反应,制得聚硅氧烷/TiO2复合膜,实现TiO2在立体交联膜中的分散及与聚硅氧烷基体的有效复合.通过红外分析、电镜观察、拉伸实验和紫外-可见光透过测试,对聚硅氧烷的组成和交联结构、复合膜的形态结构及其拉伸和光学性能进行表征和分析.发现原料硅油的扩链处理和SiO2的补强作用有助于提高反应的过程稳定性及复合膜的拉伸性能.亲水性的粉体TiO2在成膜过程中易发生进一步的大规模团聚,这在膜表面构筑微纳结构的同时会劣化膜材的力学、光学性能.溶胶-凝胶法自制钛溶胶颗粒表面残留有部分未脱除的有机基团,这使其具有一定的亲油性和较好的有机相容性,因而钛溶胶颗粒可在有机介质和聚硅氧烷膜中达到初级粒子形式的均匀稳定分散.上述形态结构,可使相应复合膜具有更佳的拉伸性能和紫外屏蔽/可见光透过性能,并有望在保持复合膜高耐老化性的同时具有高效的光催化性能. 相似文献
8.
9.
10.
设计开发了以聚硅氧烷材料为基础的皮肤组织黏接剂, 其主要由硅氧烷预聚体、 含氢硅油交联剂和卡斯特催化剂等多组分构成. 在卡斯特催化剂作用下, 预聚体和交联剂室温下在皮肤表面原位快速固化, 其中聚硅氧烷预聚体的苯甲醛侧基与皮肤组织中广泛存在的胺基通过醛胺缩合反应实现共价黏接. 本文系统研究了聚硅氧烷预聚体的聚合度、 侧基含量及交联剂的用量等参数对该黏接剂性能的影响, 得到了最大剪切黏接强度为77.6 KPa、 室温条件下100 s内即可形成稳定黏接的组织黏接材料. 该材料还具有良好的力学相容性、 生物安全性和结构稳定性, 可满足皮肤黏接剂的基本要求, 具有较好的应用前景. 相似文献
11.
Pengxiao Fang Yanyun Bai Wanxu Wang Xiaoyuan Ma XiuMei Tai 《Journal of Dispersion Science and Technology》2018,39(7):1010-1017
To investigate the effect of content of polyether (F400) grafted on the properties of polysiloxane amphiphiles, polyether was grafted on the polysiloxane by hydrosilylation reaction with H2PtCl6 catalyst. The modified polysiloxanes were divided into two types; moreover, the ratio of polyether and polysiloxane was 1:1 or 1:2. The first one was similar to the conventional surfactant structure that is BA polysiloxane amphiphile, which own one hydrophobic chain and one hydrophilic group. Another one was ABA polysiloxane amphiphile, which possess one hydrophobic chain and two hydrophilic groups at the terminal. In our work, we compared the property of modified polysiloxanes with various contents of polyether in aqueous solution at room temperature to analyze the impact of polyether content on siloxane surfactants. The conclusion was that siloxane amphiphiles possess good solubility, high surface activity, and excellent spreading property. 相似文献
12.
Yun Xia QI Shi Gui ZHAO Wei Feng JIANG Xin Xin YANG 《中国化学快报》2006,17(4):533-536
Allyl terminated polyether was used to improve the hydrophilicity of addition-cured room temperature vulcanization silicone rubber. With the increasing of the polyether, both the hydrophilicity and water absorbed of the vulcanizates were increased. The mechanical properties were also improved by adding the polyether. The result showed that 1.5wt% of the polyether provided the silicone rubber with proper hydrophilicity. 相似文献
13.
Kongliang Xie Yi Chen Aiqin Hou Yaqi Shi 《Journal of Dispersion Science and Technology》2013,34(10):1474-1480
A series of the polysiloxane materials modified with tertiary amino groups were synthesized. FTIR, 1H NMR were used to characterize the polysiloxane structure. The emulsions of the modified polysiloxanes are prepared. Some surface properties of the polysiloxane materials with tertiary amino groups as resins were discussed. The results show that the polysiloxane materials modified with tertiary amino side chains had good flexibility and the repellency to water. With increasing the amino value of the polysiloxanes, the flexibility of the fabrics treated with the emulsion was improved. After the samples treated with the polysiloxanes, the thermal yellowing of the polysiloxane had emerged. The whiteness of fabrics treated with the polysiloxane decreased. The K/S of the yellow fabrics treated with the modified polysiloxanes had not obvious change, the K/S of the red and blue fabrics treated with the modified polysiloxanes slightly decreased. The shapes of the reflectance spectra curves of the dyed fabrics treated without and with the modified polysiloxanes had not noticeable change. 相似文献
14.
15.
Waêl Moukarzel Jean‐Daniel Marty Dietmar Appelhans Monique Mauzac Juliette Fitremann 《Journal of polymer science. Part A, Polymer chemistry》2013,51(17):3607-3618
A straightforward method for the preparation of polysiloxanes grafted with carbohydrate side groups is described. Two kinds of backbones have been functionalized, namely one‐dimensional, linear polysiloxanes, and hyperbranched poly(siloxysilane)s based on cyclotetrasiloxanes. The method enables us to keep a good integrity of the polysiloxane backbone. The introduction of intermediate activated esters as side groups on the polysiloxane backbone ensures a complete homogeneity of the reaction medium during sugar grafting in dimethyl sulfoxide, and consequently an easy grafting with the unprotected amino sugar. Solubility of the resulting polysiloxanes has been tested in various solvents. The sugar‐grafted polysiloxanes are good candidates for applications such as silicone formulations, hydrophilic silicone elastomers, interactions with metallic nanoparticles, and suspension stabilization, or as starting point for the design of more complex polysiloxanes for molecular recognition. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3607–3618 相似文献
16.
Impacts of filler covalent and non‐covalent modification on the network structure and mechanical properties of carbon–silica dual phase filler/natural rubber 下载免费PDF全文
The carbon–silica dual phase filler (CSDPF) was modified by bis (3‐triethoxy‐silylpropyl) tetrasulphane (Si69) and 1‐allyl‐3‐methyl‐imidazolium chloride (AMI), respectively. The natural rubber (NR) vulcanizates filled with modified CSDPF were fabricated through mechanical mixing followed by a high‐temperature cure process. The impacts of filler surface modification on the curing characters, crosslinked junctions, network structure, and mechanical properties of NR vulcanizates were investigated. The results showed that the Si69 interacted with CSDPF through covalent bond, while the interaction between AMI and CSDPF was hydrogen bond. Both modifications increased the cure rate of CSDPF/NR compounds as well as the crosslinked degree, compared with those of pristine CSDPF/NR compound. The modifications improved the dispersion of CSDPF in NR matrix. The covalent modification by Si69 caused a limited movement of NR chains in the CSDPF surface, which contributed to a greater tensile modulus of Si69‐modified CSDPF/NR. However, the higher content of mono‐sulfidic crosslink and the poorer content of strain‐induced crystallization in the NR matrix led to a slight increase of tensile strength and tear strength of Si69‐modified CSDPF/NR, compared with those of CSDPF/NR. The tensile modulus of AMI‐modified CSDPF/NR had a lower value due to a faster polymer chain motion on the CSDPF surface. However, the tensile and tear strength of AMI‐modified CSDPF/NR increased significantly because of the increase of mono‐sulfidic crosslink, strain‐induced crystallization, and the existed hydrogen bond between CSDPF and NR. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
17.
Dennis Meier Volker Huch Guido Kickelbick 《Journal of polymer science. Part A, Polymer chemistry》2021,59(20):2265-2283
Polysiloxanes are an important class of polymers for optoelectronic applications. Novel polysiloxanes with high-refractive index (RI) based on phenanthrenyl-substituted monomers are prepared by a polycondensation reaction starting from various substituted dialkoxysilanes as monomers. The substitution patterns on the Si atom are systematically changed to vary the properties of the linear polymers as well as the final cured material. The two monomers with polycyclic aromatic side groups 9-phenanthrenylmethyldimethoxysilane and 9-phenanthrenylphenyldimethoxysilane are synthesized and fully characterized, including their single crystal X-ray structures. Linear polysiloxanes with variations in hydride, methyl, vinyl, phenyl, and phenanthrenyl side group content are prepared by acid- and base-catalyzed polycondensation reactions. Both Si H and Si vinyl substituted polymers with molecular weights up to 30 kDa and adjustable RI's from 1.52 to 1.63 are obtained and the thermally cured by Pt-catalyzed hydrosilylation reactions. Polysiloxane resins are obtained with high-RI's, optical transmittance above 95% and thermal stabilities up to 420°C. Long-term thermal stability tests show transmittance values above 85% even after 60 days of thermal treatment at 180°C. 相似文献
18.
G. Lligadas J. C. Ronda M. Gali U. Biermann J. O. Metzger 《Journal of polymer science. Part A, Polymer chemistry》2006,44(1):634-645
Oligomeric polyether polyols were obtained through the acid‐catalyzed ring‐opening polymerization of epoxidized methyl oleate and the subsequent partial reduction of ester groups to give primary alcohols. The oligomers were characterized with titration, spectroscopic techniques (Fourier transform infrared and nuclear magnetic resonance), matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry, size exclusion chromatography, and differential scanning calorimetry. Depending on the degree of reduction, polyols of different hydroxyl content values were obtained and were reacted with 4,4′‐methylenebis(phenyl isocyanate) to yield polyurethanes. These materials, which were characterized by differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis, could behave as hard rubbers or rigid plastics. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 634–645, 2006 相似文献