Hyperbranched polymers (HBPs) formed by a self-condensing vinyl polymerization (SCVP) of copolymerization of AB* monomers slowly added into trifunctional C 3* cores under various feed rates were investigated by a kinetic model. The dependences of average molecular weight, polydispersity, degree of branching, and number of structural units of the hyperbranched polymers on the feed rate were calculated by a generating function method. It was found that the final polydispersity index (PDI) can be attained below 1.5 by a slow addition of AB* at a feed rate parameter, φ, less than 2. While the AB* monomers fed quickly, the system with a lower content of the C 3* cores results in a broader molecular weight distribution. A high degree of branching, about 0.66, can be achieved by addition of AB* monomers into a small amount of C 3* cores at φ lower than 10.
A highly stable C60-incarcerated hemicarceplex, which retains its molecular integrity after heating at 523 K in air for at least 3 h, significantly increases the solubility of C60 in nonpolar solvents and increases the reduction potentials of the entrapped fullerene. Modification with [(η(5)-C5Me5)Ru(II)](+) dramatically increases the solubility of this hemicarceplex in polar, protic solvents (e.g., MeOH).
The Na+ ion–assisted recognition of urea derivatives by BPX26C6 has allowed the construction of a redox-controllable [2]rotaxane-type molecular switch based on two originally very weakly interacting host/guest systems. Using NOBF4 to oxidize the triarylamine terminus into a corresponding radical cation attracted the macrocyclic component toward its adjacent carbamate station; subsequent addition of Zn powder moved the macrocyclic component back to its urea station.
A post generation method for test time reduction of scan-designed circuits is developed in this paper. Maximum overlopping condition between consecutive applied patterns is identified. The application of the condition facilitated with the developed active &ding compatibility process significantly reduces the number of test clocks. It is demonstrated that the test clocks can be redud by 50% on average from given test sets. Further evaluation shows that, for parity-scan, the test clocks required by our developed method are only 41% of those in [ 3 ] .
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