- 上一篇：1,2-二[4-(5-溴-2-氯苯甲基)苯氧基]乙烷的合成研究
- 下一篇：金属酞菁磁性催化剂的制备及其在烯烃环氧化反应中的应用
nanoparticles . Various interactions such as, polymer–polymer, polymer–particle, particle–particle might co-exist in a polymer– particle composite system. The particle–particle interaction between the inpidual particles is obvious to occur when their separation distance is small compared with the particle size. Similarly, polymer–polymer interaction between the inpidual polymer macromolecular units will occur if the separation distance is less than polymer macromolecular size. In case of interactivepolymer–particle system, a polymer–particle network model formed by polymer–particle junction had been considered . In
such interactive system, polymer structure can be changed. For example, adsorbed polymer layers over surfaces of colloidal nanoparticles in a concentrated solution system and the repulsions between adsorbed layers on neighboring particles leading to collapse of polymer layers were observed by small-angle neutron scattering (SANS) technique . The rheological properties of polymer–nanoparticle mixture is dependent on how nanoparticles influence chain
conformation, interchain polymer packing. Because of the complex phase behavior and rheology of the initial polymer–nanoparticle mixtures, there is a lack of general agreement on the fundamental determinants of the macroscopic properties of the final polymer– particle nanocomposite product . The objective of this study was to examine the polymer chain conformations in presence of silica nanoparticles of a dilute and highly interactive polymer–nanoparticle system using the SANS technique. Polymer to silica ratio ranges from 100 to 0.02. We selected an idealized model system comprised of a well characterized hard spherical and hydrophilic silica nanoparticles of 80 Å radii and hydrophilic polyvinyl alcohol
of 61 kDa molecular weight. A clearer understanding on the polymer– particle interaction was anticipated in our study as the solution system studied here was dilute and aggregation-free than those reported earlier by others that involved complex polymer–particleinteractions resulted from additional aggregation in melt or concentrated polymer solution systems.polymer and between clusters, with a dilute solution of particles between the volume fraction of silica The spatial extent of the argument is reduced; so the average net potential force does not exist. A stronger interaction between the silica and the polymer. When silica system having a high volume fraction of dilute low polymer, the polymer chain is clearly more attractive silica, and absorbed into the hard surface of the silica and their excellent scattering data, the spherical silica particles is formed polymer shape core and a unit called the corona model of interaction. Dilute systematic observation and confirmed to reduce the viscosity of the polymer will seriously alter the conformation of the polymer chains.
KEYWORDS: Hydrophilic polymer ; nanoparticles ; chains conformation
目 录
1. 绪论1
1.1.课题选择的目的和意义 1
2.2.聚合物简介2
2.3. 亲水聚合物简介2
2. 实验内容与方法4
2.1.实验内容 4
2.1.1.粘度4
2.1.2.含固量6
2.1.3. 水洗6
3. 实验数据及相关计算7
3.1. CMC7
3.1.1.CMC3018
3.1.2.CMC301S9
3.2. PVA10
3.2.1.PVA178812
3.2.2.PVA24-88P13
3.3. HEC14
3.3.1.HEC 30000万14
3.4. TS 14110416
3.4.1 TS 14110416
3.5. XP 02-007/217
3.5.1 XP 02-007/217
3.6. 羟乙基18
3.6.1 羟乙基18
3.7. M55019
3.7.1 M55019
3.8. 水洗20