Theoretical design of high-spin biradical molecules with heterocycles as end groups;

The results show that the dendrimers of ester as end group have visbreaking effect on the crude oil.

Methoxy or methacrylic end groups were prepared,upon reacting the residual NCO moiety with either methanol or hydroxyethylmethacrylate.

Four open chain crown ethers using parahydroxylbenzaldehyde,β-aminoacid schiff base as end group were snythesized by the condensation of polyethylene glycol bridged diarylaldehyde with orthoaminobenzoic acid.

Study on synthesis and properties or noncyclic crown ethers with phenyl thiocarbamide acetic acids as terminal groups;

Three noncyclic crown ethers with 1 phenyl 3 benzoyl thiocarbamide as terminal groups were synthesized by treating diaromatic amides bridged in noncyclic crown ether with benzoyl isothiocyanate by refluxing acetone.

The determination of polymerization degree of ammonium polyphosphate by end-group titration;

Conclusion was made by comparing with the test result of nuclear magnetic resonance spectroscopy:the end-group titration is only suitable for testing average degree of polymerization of ammonium polyphosphate product with high water dissolvability and not suitable for produc.

Besides,the application of MALDI technique on the determination of molecular weight distribution,end group information,copolymer composition and mechanism of polymerization and degradation were reviewed.