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Increasing temperature has been widely considered as a primary and effective way to improve the segmental mobility of polymer chains and subsequently cause polymer chains to flow. Here, by confining the morphology of polymers into nanospheres and combining this process with external stress, we present an important new approach to achieve the cold flow of glassy polymers at room temperature, under...
A number of unreported zinc complexes based on tridentate O,N,O-type half-Salen ligands were prepared. All the complexes were characterized by 1H, 13C NMR and elemental analysis. These complexes were used as catalysts with 2-propanol for the ring-opening polymerization of l-lactide and rac-lactide. They were effective in lactide polymerization with good conversions. And polymerizations were living...
The external plasticization of polyacrylonitrile (PAN) with high molecular weight was achieved, where 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) was explored as a novel plasticizer. The interaction and plasticization mechanism in PAN/[Bmim]Cl system were investigated. The Fourier transform infrared spectroscopy (FTIR) results show that there exists strong hydrogen interaction between nitrile...
We propose a general reaction induced hetero-epitaxial crystallization strategy for the preparation of high performance aromatic polymers/CNT nanohybrid shish-kebab structures, typical aromatic polymers such as polyazomethine and polyimide have been successfully decorated on the surface of CNTs through this novel approach. It is interesting to note that the introduction of dynamic imine chemistry...
Here, we present a novel constitutional dynamic chemistry controlled reaction induced crystallization strategy for the morphological controlling of aromatic polyazomethines. Complex nanostructured polyazomethines with sphere, elliptic, discus and disk-like morphologies can be readily fine tuned by varying the ratio of reagents in the dynamic imine exchange reaction. After pyrolysis, hierarchically...
Several non-metallocene-type titanium(IV) complexes containing phenoxy-phosphine or thiophenoxy-phosphine ligands of type, (2-R 1 -4-R 2 -6-PPh 2 -C 6 H 2 X) 2 TiCl 2 (2a: X = O, R 1 = R 2 = t-Bu; 2b: X = O, R 1 = R 2 = cumyl; 2c: X = S, R 1 = SiMe 3 , R 2 = H) have been synthesized...
Novel terpolymers containing ethylene, 1-hexene and dicyclopentadiene (DCPD) were synthesized using bis(β-enaminoketonato)titanium catalysts [PhNC(R 2 )CHC(R 1 )O] 2 TiCl 2 (1a: R 1 = Ph, R 2 = CF 3 ; 1b: R 1 = CF 3 , R 2 = CH 3 ). In the presence of modified methylaluminoxane, these catalysts afforded terpolymers...
A series of novel half-metallocene-type titanium complexes CpTiCl 2 [PhNC(R 2 )CHC(R 1 )O] (2a, R 1 = Cy, R 2 = CF 3 ; 2b, R 1 = t Bu, R 2 = CF 3 ; 2c, R 1 = Ph, R 2 = CF 3 ; 2d, R 1 = Ph, R 2 = CH 3 ) have been synthesized by treating CpTiCl 3 with the corresponding...
Wholly aromatic poly(aryl ether ether nitrile)s containing naphthalene structure with sulfonic acid groups meta to ether linkage (m-SPAEEN), intended for fuel cells applications as proton conducting membrane materials, were prepared via nucleophilic substitution polycondensation reactions. The incorporation of rigid naphthalene structure with meta-sulfonic acid groups was with the intent of improving...
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