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81.
Ohne Zusammenfassung 相似文献
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Ohne Zusammenfassung 相似文献
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Thomas G. McKenzie Jing M. Ren Dave E. Dunstan Edgar H. H. Wong Greg G. Qiao 《Journal of polymer science. Part A, Polymer chemistry》2016,54(1):135-143
Core cross‐linked star (CCS) polymers with radiating arms composed of high‐order multiblock copolymers have been synthesized in a one‐pot system via iterative copper‐mediated radical polymerization. The employed “arm‐first” technique ensures the multiblock sequence of the macroinitiator is carried through to the star structure with no arm defects. The versatility of this approach is demonstrated by the synthesis of three distinct star polymers with differing arm compositions, two with an alternating ABABAB block sequence and one with six different block units (i.e. ABCDEF). Owing to the star architecture, CCS polymers in which the arm composition consists of alternating hydrophilic–hydrophobic (ABABAB) segments undergo supramolecular self‐assembly in selective solvents, whereas linear polymers with the same block sequence did not yield self‐assembled structures, as evidenced by DLS analysis. The combination of microstructural and topological control in CCS polymers offers exciting possibilities for the development of tailor‐made nanoparticles with spatially defined regions of functionality. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 135–143 相似文献
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Abstract The photoluminescence (PL) of a CdTe/CdMnTe superlattice has been studied at pressures up to 4.1GPa, where the phase transition occurs. PL is observed up to this pressure, and it moves to higher energy with pressure at 66meV/GPa. This result is consistent with theory. Magnetic fields decrease the band-gap of the semimagnetic CdMnTe barriers and this reduces the PL energy. The pressure dependence of this effect is expected to provide a stringent test of the theory of semimagnetic materials and of superlattices. 相似文献
87.
Sandip N.Gavade Ravi S.Balaskar Madhav S.Mane Pramod N.Pabrekar Murlidhar S.Shingare Dhananjay V.Mane 《中国化学快报》2011,22(6):675-678
The coupling reaction of phenylurea with different functionalized aryl halides in the presence of air stable CuI,N,N-dimethylethylenediamine as a ligand,and K3PO4 as a base gives symmetrical and unsymmetrical diarylureas in relatively high yields.This method is milder than the palladium catalyzed arylation and avoids the use of toxic phosphine ligands. 相似文献
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Andrew B. Rodd David E. Dunstan Simon B. Ross-Murphy David V. Boger 《Rheologica Acta》2001,40(1):23-29
A large body of literature is focused on the accurate determination of a gel point for systems undergoing a sol-gel phase
transition. Investigation into the limiting strain and stress for linear viscoelastic behaviour at various stages of a phase
transition such as gelation is a subject that is rarely commented on. The small amplitude oscillatory rheological behaviour
of a biopolymer cross-linker system through a thermally activated sol-gel transition is presented. Mechanical spectra were
interpreted through application of the gelation criteria of Chambon and Winter (Winter and Chambon 1986; Chambon and Winter
1987), where the (so-called gel strength) parameter S, and relaxation exponent, n are obtained. A detailed study of the limit of linear viscoelasticity yields important trends in critical stress (σ°c) and critical strain (γ°c) limits highlighting the possible experimental difficulties associated with mechanical measurements obtained in close proximity
to the gel point.
Received: 17 March 2000 Accepted: 2 October 2000 相似文献
90.
The absorption spectrum of a-Si: H below the gap consists of an exponential tail whose slope is independent of temperature (up to ≈ 400 K). The excitation spectrum of the 1.4 eV photoluminescence follows the absorption closely. We interpret this in terms of a zero-phonon model for the absorption and emission transitions, and show that this model is compatible with the known behaviour of the photoluminescence. 相似文献