全文获取类型
收费全文 | 530篇 |
免费 | 22篇 |
国内免费 | 71篇 |
专业分类
化学 | 450篇 |
晶体学 | 3篇 |
力学 | 26篇 |
综合类 | 10篇 |
物理学 | 134篇 |
出版年
2022年 | 2篇 |
2021年 | 4篇 |
2020年 | 15篇 |
2019年 | 9篇 |
2018年 | 9篇 |
2017年 | 15篇 |
2016年 | 18篇 |
2015年 | 12篇 |
2014年 | 17篇 |
2013年 | 43篇 |
2012年 | 28篇 |
2011年 | 32篇 |
2010年 | 35篇 |
2009年 | 40篇 |
2008年 | 42篇 |
2007年 | 49篇 |
2006年 | 37篇 |
2005年 | 35篇 |
2004年 | 24篇 |
2003年 | 36篇 |
2002年 | 13篇 |
2001年 | 16篇 |
2000年 | 13篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 9篇 |
1996年 | 13篇 |
1995年 | 3篇 |
1994年 | 9篇 |
1993年 | 8篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1981年 | 4篇 |
排序方式: 共有623条查询结果,搜索用时 250 毫秒
41.
The effect of nanoclay on the phase-separation behavior of poly(methyl methacrylate)/poly(vinyl acetate)(PMMA/PVAc) blends has been mainly investigated by small-angle laser light scattering. It is found that the effect of clay on the thermodynamics and kinetics of phase-separation for PMMA/PVAc blends seems inconsistent. The kinetics phaseseparation rate decreases, while the thermodynamics parameters, cloud points Tc and delay time tD of isothermal phaseseparation also decrease, and the variation amplitude depends on the matrix composition. The affinity of clay to PMMA results in the composition difference between the border layer and the polymer matrix and further causes the concentration fluctuation at the early stage of phase separation to reduce Tc and tD. On the other hand, the decrease of phase-separation rate is caused by the mechanical barrier effect of clay on the macromolecular diffusion of blend matrix. Hence, such seemingly counterintuitive results on the thermodynamics and kinetics of phase-separation are attributed to different dominant factors. 相似文献
42.
43.
Dynamic fracture in single-edge notched polymethyl-methacrylate (PMMA) beams have been investigated by three-point-bending impact testing with a drop-weight machine. A high-speed camera combined with the digital image correlation (DIC) method is used to capture the impact-induced crack initiation and propagation, as well as the beam deformation fields and the open mode strain at the original notch tip. The crack propagation length is recorded and the instantaneous crack velocity is calculated. Furthermore, the dynamic fracture toughness KId is quantified from the loading-displacement relations at different impact velocities. The effects of the impact velocity and impact energy on dynamic fracture toughness, fracture initiation strain, as well as the corresponding influences on the fracture propagation velocity, are discussed. 相似文献
44.
《Analytical letters》2012,45(17):2569-2579
With the aim of obtaining stable antibody immobilization on the poly(methyl methacrylate), PMMA channel surface, PMMA substrates were activated with O2 plasma treatment to introduce surface polar groups on it. The plasma-treated PMMA surfaces were characterized using water contact angle measurement, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). It was observed that plasma treatment significantly improved the surface wettability with changing surface chemistry and topography. The strategy of immobilization of a model antibody, anti-goat IgG on plasma-treated PMMA involved two steps. First the plasma-treated PMMA was functionalized with (3-aminopropyl)thriethoxy silane, APTES off-chip which facilitated covalent capturing of antibody via a crosslinking agent in the inner surface of PMMA channel in the second step. The antibody immobilization on plasma-treated PMMA was also confirmed using AFM, XPS, and fluorescence microscopy. The anti-IgG covalently captured on channel surface was evaluated with sandwich ELISA protocol on-chip using fluorescence microscopy. The observed results demonstrate that this technique could be extended to integrate the current diagnostic techniques into the plastic chip for important biomarker diagnosis. 相似文献
45.
高聚物PMMA的受力变形行为与粘弹-塑性本构理论模型 总被引:1,自引:0,他引:1
对高聚物PMMA实验测定了不同(T,ε)的单轴加卸载循环的应力-应变曲线。讨论了应力促进热激活塑性变形的活化粘壶理论和塑性变形的发展规律。提出由SLS或MS与活化粘壶作串联耦合的粘弹-塑性本构理论模型,给出了微分和积分形式的本构方程组,用于拟合求解加卸载循环的应力-应变曲线,获得良好吻合的结果。详细讨论了PMMA在加载过程中的受力变形行为,包括起始加载的粘弹性变形,ε_v和ε_p的互相挤占,屈服点,以及屈服后应变软化和硬化的抗衡过程。对应变软化-硬化效应提出一种新的起因于粘弹变形内禀滞后效应的理论解释,并定名为粘弹软化-强化效应。对所包含的粘弹变形成分,从E_v的移位因子和归一化应力-应变主曲线两方面,讨论了可能存在的率温等效关系。 相似文献
46.
Three kinds of europium β-diketonates Eu(DBM)3, Eu(BA)3 and Eu(TTA)3 (DBM: Dibenzoylmethane; BA: 1-Benzoylacetone; TTA: Thenoyltrifluoroacetone) were doped in poly(methyl methacrylate) (PMMA) matrix. The doped systems were studied by using photoluminescent (PL) spectroscopy, emission decay experiments and X-ray diffractometry. Eu(III) ions in the doped Eu(DBM)3/PMMA systems have two distinct symmetric sites and the emission band changes greatly with the compositions. Eu(III) in the Eu(BA)3/PMMA systems gives only one symmetric site in the doped systems and the emission band changes slightly with the compositions. Although two distinct symmetric sites of Eu(III) can be distinguished in the doped systems of Eu(TTA)3/PMMA, the two sites have similar 5D0 lifetimes and the luminescent spectra almost do not change with the compositions. XRD reveals that crystallites were formed in the doped Eu(DBM)3/PMMA systems that have different crystalline structure from that of the chelate, and Eu(BA)3 and Eu(TTA)3 exist in amorphous state in the doped systems. The difference between the PL properties and structures of the doped systems for the three kinds of chelates should be attributed to different interactions between the chelate molecules and between the chelate and PMMA. 相似文献
47.
Polymethyl methacrylate modified carbon nanotubes were prepared using γ radiation, and the modified carbon nanotubes exhibited
strong luminescence (∼
∼568 nm) at room temperature and an absorption peak at ∼
∼247 nm can be observed in the polymer modified samples. 相似文献
48.
Patrick F. Conforti Manish Prasad Barbara J. Garrison 《Applied Surface Science》2007,253(15):6386-6389
The effects of absorption of 7.9 and 5.0 eV photons by the polymer poly(methyl methacrylate) are studied using molecular dynamics simulations. By rapidly depositing a critical amount of thermal energy in the surface region (greater than 0.03 eV Å−3), a pressure wave is formed which causes spallation of the substrate. If there is only one photon absorbed per monomer unit of the polymer, the 7.9 eV photons can supply sufficient energy density to initiate ejection. 相似文献
49.
Mireia Morell Brigitte Voit Xavier Ramis Àngels Serra Albena Lederer 《Journal of polymer science. Part A, Polymer chemistry》2011,49(14):3138-3151
Well‐defined multiarm star block copolymers poly(glycidol)‐b‐poly(methyl methacrylate) (PGOHBr‐b‐PMMAx) with an average number of PMMA arms of 85, 55, and 45 have been prepared. The core‐first approach has been selected as the methodology using atom transfer radical polymerization (ATRP) of MMA from an activated hyperbranched poly(glycidol) as the core. These activated hyperbranched macroinitiators were prepared by esterification of hyperbranched poly(glycidol) (PGOH) with 2‐bromoisobutyryl bromide. The effect of monomer/initiator ratio, catalyst concentration, time, temperature, and solvent on the growing of the arms has been studied in detail in order to optimize the process and to diminish the radical‐radical coupling. The final products and intermediates were characterized by means of size exclusion chromatography (SEC), nuclear magnetic resonance (NMR) and Fourier transform‐infrared (FTIR) spectroscopy. The length of PMMA arms was determined by SEC after cleavage of ester bond linked to PGOH core. Glass transition temperature (Tg), thermal stability and rheological properties of the multiarm star copolymers were also studied. Finally, tapping mode atomic force microscopy (TMAFM) allowed the clear visualization of nano‐sized particles (80–200 nm) corresponding to individual star molecules. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 相似文献
50.
Kazem Jeddi Nader Taheri Qazvini Seyed Hassan Jafari Hossein Ali Khonakdar Javad Seyfi Uta Reuter 《Journal of Polymer Science.Polymer Physics》2011,49(4):318-326
Polymer–silicate nanocomposites based on poly (ethylene oxide), PEO, poly(methyl methacrylate), PMMA, and sodium montmorillonite clay were fabricated and characterized to investigate the effect of nanolayered silicates on segmental dynamics of PEO/PMMA blends. X‐ray results indicate the formation of an exfoliated morphology in the nanocomposites. At low silicate contents, an enhancement in segmental dynamics of blend nanocomposites and also PEO, minor component in blend, is observed at temperature region below blend glass transition. This result can be attributed to the improvement of the confinement effect of rigid PMMA matrix on the PEO chains by introducing a low amount of layered silicates. On the other hand, at high silicate contents, an enhancement in segmental dynamics of blend nanocomposites and PEO is observed at temperature region above blend glass transition. This behavior could be interpreted based on the reduction of monomeric friction between two polymer components, which can facilitate segmental motions of blend components in nanocomposite systems. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 相似文献