Poly（ conjugates ester） s（ PCEs） are unsaturated polyesters containing acryloyl skeletons on their back bone. PCEs can prepared by polycondensation of acrylates bearing two reactive groups and ring-opening po lymerization（ ROP） of cyclic acrylates. PCEs are photo- and thermo-curable and capable of quantitative post polymerization modification by thiol-ene reaction, and some of them undergoes chemoselective main-chain scission by conjugate substitution reaction. Therefore, PCEs are promising reactive polymers, and recent studies on PCEs have referred a potential as a precursor of bio-degradable polyesters. In this review, I report synthesis, properties and some application examples of PCEs.

Polysilsesquioxane（ PSQ）, a kind of silicone compounds, has an organic component at each silicic acid unit in addition to the inorganic polysiloxane backbone. For this reason, the PSQ is recognized to be a useful oraganic-inorganic hybrid material, which should show favorable moldability, flexibility, or reactivity based upon the property of the involved organic component in addition to excellent heat tolerance, weatherability, and mechanical strength. For the application of the PSQs, which contained phenyl groups with the functional group such as 2-cyanoethyl, 3-acetoxypropyl, 3-glycidyloxypropyl, 3-mercaptpropyl, or n-hexyl, in the field of adhesive material, the required properties were evaluated. From the results of the examinations, the PSQ having phenyl and cyano groups was found to be the desired material with good transparency and enough heat resistance. In addition, the adhesive obtained from the above PSQ showed the wide selectivity to the adherends such as glass, Copper, and Si wafer. On the basis of such findings, the PSQ mentioned above has been utilized as the main material of the specific adhesive for LED. On the other hand, the PSQs grafted various organic polymers from the polysiloxane backbone were also expected to be the useful adhesive materials. Therefore, the adhesive properties of the PSQs containing the copolymers of n-butyl acrylate and 4-acryloylmorphline were investigated. In these examinations, the interesting adherend selectivity and the adhesive abilities, which reflected the properties of the monomers and the sequence of the monomer units in the graft chains, were observed.

Optically active cis-stereoregulated polyacetylenes substituted with amide, carbamate and hydroxy groups

adopt helical conformation with predominantly one-handed screw sense stabilized by hydrogen bonding

between the side chains. Polyphenyleneethynylenes substituted with amide groups also adopt helically folded

conformation in a similar fashion. These polymers are expected as chiral recognition, high thermal conductivity

and photoelectrically functional materials upon forming networks between the main and side chains.