Summary: A new crystal morphology (δ form) of poly(3‐hydroxypropionate) (PHP) is found in cast and melt‐crystallized PHPs with low molecular weight, in which the PHP chains possibly adopt a 21 helix rather than the trans conformation found in the β or γ form. The fusion temperature‐ and the crystallization temperature‐dependent polymorphism are responsible for the dual morphologies and the unique growth kinetics of spherulites in the melt‐crystallized PHPs.
a) A dual‐morphology developed at 70 °C in PHP films after melting at 117 °C and b) that formed during cooling at a rate of 1 °C · min−1 from 130 °C. 相似文献
Mobilities of 16 anions of rare-earth-EDTA 1:1 chelate (RE-EDTAs) were isotachophoretically measured by using two leading electrolytes (pH 3.6 and 6.0) in order to assess their separation behavior. The leading electrolyte was 20 mM hydrochloric acid. The pH of the solution was adjusted to 3.6 by adding beta-alanine and to 6.0 by adding histidine. The obtained mobilities were very close to each other in the range 20.1x10(-5)-21.9x10(-5) cm2 V(-1) s(-1) with the minimum mobilities for Pr-EDTA and Nd-EDTA for pH 3.6 and 6.0, respectively, and pH dependence was hardly observed. On the basis of the above knowledge. minor rare-earth elements in a standard iron ore sample were determined as RE-EDTAs by bidirectional isotachophoresis-particle-induced X-ray emission (PIXE), where the Fe(II) matrix digested by alkali fusion was separated as Fe(II)Phen3(2+) (phen = 1,10-phenanthroline). Since 5% of the total iron was still detected as Fe(III)EDTA- and might disturb PIXE analysis of RE-EDTA-, itaconic acid was used as the spacer for Fe(III)EDTA- and RE-EDTA-. The fractions of RE-EDTA- were successfully analyzed off-line by a multielemental analytical method, PIXE [analytical result (3.62% (w/w) as RE2O3]; the nominal value was 3.37% (w/w) as RExOy. 相似文献
We calculate the relaxation dynamics of the average energy of solute-solvent systems as well as time-dependent solute-solvent radial distribution functions by means of the reference interaction-site model (RISM) theory. Compared with the experimental results obtained in our previous work, we suggest that the rearrangement of the further solvation shell could be important for the relaxation dynamics of the inhomogeneous spectral band width observed by means of transient hole-burning and time-resolved fluorescence spectroscopy. 相似文献
The muon science facility is one of the experimental arenas of the JKJ project, which was recently approved for construction
in a period from 2001 to 2006, as well as neutron science, particle and nuclear physics, neutrino physics and nuclear transmutation
science. The muon science experimental area is planned to be located in the integrated building of the facility for the materials
and life science study. One muon target will be installed upstream of the neutron target in a period of phase 1. The beam
line and facility are designed to allow the later installation of a 2nd muon target in a more upstream location. The detailed
design for electricity, cooling water, primary proton beam line, one muon target and secondary beam lines (a superconducting
solenoid decay muon channel, a dedicated surface muon channel, and an ultra slow muon channel) is underway. In the symposium,
a latest status of the muon science facility at JKJ project will be reported.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
Films of an α‐cyclodextrin/poly(ε‐caprolactone) inclusion complex have been successfully prepared and show high transparency and heat resistance in comparison to the pure polymer film. The physical properties, such as transparency, mechanical properties, and thermal stability, of the α‐CD‐PCL‐IC films are found to depend on the α‐cyclodextrin‐to‐polymer stoichiometry.
Using four recent tube models of rubber-like elasticity, a literature set of tensile and permanent set data for a silica-filled silicone network before and after γ-ray irradiation was investigated. As the silicone elastomer contained ~40 phr of silica, for the stress–strain analysis the latest filler cluster (fractal) breakup mechanism was combined with each of the tube models as a filled model along with the corresponding nonfilled one. In the first part of this study the essential parameters that the models have were determined from fits to the stress–strain data. In the last part the permanent set analysis was conducted with the parameter values, using the modified Tobolsky model involving chain scission and cross-linking. This showed very good agreement with the experimental data via any of three filled models (one of the filled models was excluded due to its intractability). It was also confirmed, as would be expected, that each of them worked more favorably than a corresponding nonfilled model. 相似文献