4 results about "Helical polymer" patented technology

The invention discloses an intracranial peripheral heart multifunctional pacing guide wire based on optical fiber sensing, and relates to the field of medical instruments, and the pacing guide wire comprises a near-end interface section, a middle sensing section and a far-end sensing section which are sequentially connected from the near end to the far end; the middle sensing section comprises a layered coaxial structure, and the layered coaxial structure comprises a core layer, a sensing waveguide layer wrapping the core layer, a conductive layer wrapping the sensing waveguide layer and a lubricating layer wrapping the conductive layer from inside to outside; a polymer waveguide extending in the axial direction of the guide wire is arranged in the sensing waveguide layer, and the track of the polymer waveguide is a three-dimensional spiral line. The three-dimensional spiral polymer waveguide is integrated in the sensing waveguide layer, the intuition and reliability of navigation can be remarkably improved, information guarantee is provided for the pacing electrode to accurately reach and stably abut against the heart target spot, and therefore the success rate and safety of an operation are improved.

The application discloses a kind of chiral helical polyisocyanide catalysts modified by proline dipeptide and preparation method, the structural formula of the catalyst is as follows:Wherein, n=50~250.The preparation method is as follows, ester exchange is carried out by three proline chains and pentafluorophenol isocyanide to prepare monomer, and the monomer is initiated by Pd (II) catalyst to prepare chiral helical polymer, and then the tert-butyloxycarbonyl protecting group is removed to prepare chiral helical polyisocyanide catalyst with catalytic function.The proline dipeptide modified chiral helical polyisocyanide catalyst prepared by the application can be prepared by active controlled polymerization of corresponding monomer, the molecular weight is controllable, the molecular weight distribution is relatively narrow, and can be used for catalyzing asymmetric aldol and Michael addition reaction, and the preparation method is simple, environment-friendly, and the yield is high.

A polymer comprising repeating units comprising aromatic ring moieties in the backbone, wherein the helical polymer structure is provided by a pi-pi interaction between the aromatic ring moieties; a package comprising a polymer; and methods of making the polymer and packaging. The polymer imparts moisture barrier properties and gas barrier properties to the package.

This invention discloses a coordination polymer-coated catalytic material derived from twisted polypyrrole nanotubes, its preparation method, and its applications. First, using a chiral surfactant as a template, a helical polymer structure is formed by inducing polymer monomers to act as the core. Then, a transition metal source is introduced to further assemble a helical support. Next, an organic ligand is used for coordination coating to form a shell. Finally, after pyrolysis under an inert gas, a dense twisted carbon layer is formed at the core-shell interface, yielding the coordination polymer-coated catalytic material derived from twisted polypyrrole nanotubes. The introduction of the helical core in this catalytic material not only helps form a twisted carbon interface but also helps induce a uniform distribution of transition metal active sites. The preparation method of this invention is convenient, and the obtained catalytic material exhibits good oxygen reduction / evolution bifunctional catalytic activity, stability, and applicability to flexible zinc-air batteries.