Preparation process for macromolecule single stranded

Abstract

The invention discloses a method for preparing a polymer single chain, which relates to a preparation process of a polymer single chain. The invention provides a method for preparing a polymer single chain in order to solve the shortcomings of the prior art that the number of polymer single chain samples is small and difficult to collect. The present invention comprises the following steps: a. dissolving the polystyrene polymer in methylene chloride to prepare a polystyrene solution with a concentration of 2.0×10-3 to 3.0×10-3 g / ml, stirring the solution magnetically to make Polystyrene molecular chains are isolated from each other in the solution; b. Add the solution dropwise to the ethanol solution, magnetically stir and mix the solution, control the temperature between the boiling point of dichloromethane and the boiling point of ethanol, and keep the temperature constant for 0.5 to 1 hour. The chain polystyrene is precipitated into the ethanol solution; c. Centrifuge or filter the ethanol solution to obtain single-chain polymer particles that collapse into a spherical shape. The invention has the advantages of simple process, low cost and easy collection of polymer single chains.

Description

Technical field: [0001] The invention relates to a preparation process of a polymer single chain. Background technique: [0002] With the continuous warming of nanotechnology in the field of polymers, polymer single-chain and oligo-chain condensed matter has become a new field in the research of polymer condensed matter physics. Polymer single chains generally exist in isolation as nanoscale particles without entanglement between molecules, which is completely different from the classic concept of polymer entanglement condensed matter. In a theoretical sense, a single-chain polymer is the simplest system. From a practical point of view, we know that when the structural unit scale of many materials is reduced to the category of nanomaterials, the materials may have many strange properties. These properties have been widely verified and applied in inorganic materials and metal materials. But for polymer materials, the current work is very little. An important reason is that...

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Problems solved by technology

But for polymer materials, the current work is very little. One important reason is that it is very difficult to prepare single-chain polymer samples, which restricts the development of experimental and theoretical research.

The currently known methods for preparing polymer single-chain particles can be divided into two classes: one is to use a very dilute solution in which the molecular chains are isolated from each other, and spray it onto a certain substrate (such as mica sheet, silicon wafer, liquid surface, etc.) ) volatilize naturally or directly freeze-dry the very dilute solution, but the solution concentration required by this method is generally at 10 -6 Below g / ml, the number of polymer single-chain samples finally obtained is not only very small, but also difficult to collect; another method is to carry out the microscopic analysis of monomers under ideal conditions where only one monomer molecule is initiated in each emulsion particle. Emulsion polymerization, although this method can provide a large number of samples, it has high requirements for experimental technical conditions and is not suitable for all polymer systems. The most important thing is that it is difficult to ensure that the obtained samples are single-chain rather than oligo-chain or multi-chain

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