A microstructure-based wormlike chain(WLC)model was proposed for semiflexible tubular polymers taking into account their hollow tube microstructure with locally orthotropic elastic properties.Closed-form analytical so...A microstructure-based wormlike chain(WLC)model was proposed for semiflexible tubular polymers taking into account their hollow tube microstructure with locally orthotropic elastic properties.Closed-form analytical solutions were obtained for the stretching behaviors and undulation space of such polymers.The results show that,in its physiologically important range of contour length L from I to 20μm,microtubule,a typical semiflexible tubular polymer,exhibits a stretching stiffness k that scales with L as k^L^(-1,3),compared with the classical WLC behavior of k^L(^-4),and that the average search space of a micro-tubule scales as V-L^(2.5),compared with the classical WLC behavior of V-L^(4).It was speculated that the unique properties of microtubules may have profound implications for their biological functions such as search and positioning of organelles.展开更多
'Stepwise-coupling polymerization' (SCP) is a very useful approach for preparing microstructure-controllable ordered network polymers, including soluble one-dimensional ladderlike polymers (LP) and tubular pol...'Stepwise-coupling polymerization' (SCP) is a very useful approach for preparing microstructure-controllable ordered network polymers, including soluble one-dimensional ladderlike polymers (LP) and tubular polymers (TP), and two-dimensional sieve-plate polymers. The novel reactive LPs are important precursors of micro-structure controllable polymers such as 'fishbone-' or 'rowboat-' like mesomorphic polymers and their metal complexes as well as tubular polymers (TPs). They are full of great potential for use as advanced materials.展开更多
The inclusion complex formation of α-CD, β-CD, and γ-CD with various water-soluble polymers has beeninvestigated, and the relationship between the chain cross-sectional areas of the polymers and the diameters of th...The inclusion complex formation of α-CD, β-CD, and γ-CD with various water-soluble polymers has beeninvestigated, and the relationship between the chain cross-sectional areas of the polymers and the diameters of the cavities ofcyclodextrins (molecular recognition) was found. Polyrotaxanes and tubular polymers were prepared on the basis ofmolecular recognition. Several kinds of polymers having tetraphenylporphyrin (TPP) and paramagnetic metallotetraphenyl-porphyrin (AgTPP, CuTPP, VOTPP or ZnTPP) have been prepared by radical polymerization of the correspondingmonomers. Visible spectra of these polymers show hypochromism in the Sorer bands of TPP moieties as compared withthose of monomers. Polymer effects were observed in the magnetic behavior and oxygen adsorption of paramagneticmetallotetraphenylporphyrin moieties. Moreover, polymer effects on photophysical and photochemical behavior were foundin the amphiphilic polymers covalently tethered with small amounts of zinc(Ⅱ)-tetraphenylporphyrin (ZnTPP).展开更多
基金Supported by Natural Science Foundation of China(11421062,11472119,11502103)the Fundamental Research Funds for the Central Universities(LZUJBKY-2015-178)
文摘A microstructure-based wormlike chain(WLC)model was proposed for semiflexible tubular polymers taking into account their hollow tube microstructure with locally orthotropic elastic properties.Closed-form analytical solutions were obtained for the stretching behaviors and undulation space of such polymers.The results show that,in its physiologically important range of contour length L from I to 20μm,microtubule,a typical semiflexible tubular polymer,exhibits a stretching stiffness k that scales with L as k^L^(-1,3),compared with the classical WLC behavior of k^L(^-4),and that the average search space of a micro-tubule scales as V-L^(2.5),compared with the classical WLC behavior of V-L^(4).It was speculated that the unique properties of microtubules may have profound implications for their biological functions such as search and positioning of organelles.
文摘'Stepwise-coupling polymerization' (SCP) is a very useful approach for preparing microstructure-controllable ordered network polymers, including soluble one-dimensional ladderlike polymers (LP) and tubular polymers (TP), and two-dimensional sieve-plate polymers. The novel reactive LPs are important precursors of micro-structure controllable polymers such as 'fishbone-' or 'rowboat-' like mesomorphic polymers and their metal complexes as well as tubular polymers (TPs). They are full of great potential for use as advanced materials.
文摘The inclusion complex formation of α-CD, β-CD, and γ-CD with various water-soluble polymers has beeninvestigated, and the relationship between the chain cross-sectional areas of the polymers and the diameters of the cavities ofcyclodextrins (molecular recognition) was found. Polyrotaxanes and tubular polymers were prepared on the basis ofmolecular recognition. Several kinds of polymers having tetraphenylporphyrin (TPP) and paramagnetic metallotetraphenyl-porphyrin (AgTPP, CuTPP, VOTPP or ZnTPP) have been prepared by radical polymerization of the correspondingmonomers. Visible spectra of these polymers show hypochromism in the Sorer bands of TPP moieties as compared withthose of monomers. Polymer effects were observed in the magnetic behavior and oxygen adsorption of paramagneticmetallotetraphenylporphyrin moieties. Moreover, polymer effects on photophysical and photochemical behavior were foundin the amphiphilic polymers covalently tethered with small amounts of zinc(Ⅱ)-tetraphenylporphyrin (ZnTPP).
