Study on hydrogenation of partial double bond of styrene series thermoplastic elastomer;

In this paper we have discussed and Compared the π bonds strength and σ bond Strength in carbon-carbon double bond and carbon-carbon triple bond.

When epoxy group is introduced into the double bonds of the main molecular chain, the molecular polarity is enhanced,while the high elongation character remains essentially.

Polysilanes with double bonds were synthesized by the electroreduction of trichloromethylsilane and allyl chloride.

Results shows that higher conjugated double bounds content in PVC resins results in lower initial coloring property,lower whiteness after ageing and lower thermal stabilization;while higher content of isolated double bonds results in lower whiteness;and higher content of iron ions results in high yellow index of PVC resins and its transparent sheet.

An acetoacetylated polyacrylate and a vinylic groups ended polyurethane were synthesized.

The main focuses are the asymmetric allylation reactions of C=N double bonds through using chiral auxiliary groups, chiral allylation reagents, and asymmetric catalysts.

Since the improper blue-shifted H-bond and dihydrogen bond were found,the unusual phenomena have attracted more and more attentions of scientists.

The dihydrogen bonds B—H…H—X and traditional H-bonds N—H…X and X—H…X(X=F,Cl,O) between B3N3H6 and each of HF,HCl or H2O were theoretically studied by use of the ab initio quantum mechanics method(MP2).

The formation of dihydrogen bonds B—H…H—C and traditional H-bonds N—H…F between B3N3H6 and HxCF4-x(x=1-3) is theoretically studied,using the density functional theory,and it is found that upon the formation of the dihydrogen bonds the BH bonds are red-shifted and the CH bonds are blue-shifts and that the formation of the traditional H-bonds make the NH bonds red-shifted.