3 results about "Characteristic ratio" patented technology

The invention discloses a construction method for realizing a homopolymer-homopolymer-double block copolymer ternary entangled polymer mixture by adopting a dissipative particle dynamics method. The method comprises the following steps: acquiring a characteristic ratio and a balance bond length of a simulation system, and generating a series of homopolymers and double-block copolymers taking the bond length as a step length; according to the chain length, the chain number and the number density of a simulation system, putting a series of obtained random walking homopolymers and copolymers into a simulation box; introducing interaction potential among particles, introducing bond-forming interaction potential by using simple harmonic spring potential, and introducing bond-angle interaction potential by using a bending potential function; the rejection parameters are gradually increased, and the difference of the rejection parameters between the stages should be kept equal or approximately equal; setting a rejection parameter as a final use value; and detecting whether the conformation of the chain is balanced. The three-element entangled polymer mixture constructed by the invention can accurately describe the dynamic and rheological properties of an entangled polymer blend, and can be used for researching the structure and rheological properties of an entangled polymer interface.

This invention discloses a method for constructing ternary entangled polymer mixtures of homopolymer-homogene-diblock copolymers using dissipative particle dynamics. The steps are as follows: obtaining the characteristic ratios and equilibrium bond lengths of the simulation system, and generating a series of homopolymers and diblock copolymers with bond lengths as step sizes; placing the obtained series of randomly walking homopolymers and copolymers into a simulation box according to the chain length, chain number, and number density of the simulation system; introducing interaction potentials between particles, using a harmonic spring potential to introduce bonding interaction potentials and a bending potential function to introduce bond angle interaction potentials; gradually increasing the repulsion parameter, ensuring that the difference in repulsion parameter between each stage remains equal or approximately equal; setting the repulsion parameter as the final value; and detecting whether the chain conformation is in equilibrium. The ternary entangled polymer mixture constructed by this invention can accurately describe the dynamics and rheological properties of entangled polymer blends and can be used to study the structure and rheological properties of entangled polymer interfaces.

The application discloses a method for identifying the source of crude oil organic matter and a chart thereof. The method comprises the following steps: separating an aromatic hydrocarbon component from a sample; obtaining a characteristic ratio for characterizing dimethylphenanthrene isomer distribution by gas chromatography-mass spectrometry, and the ratio is denoted as R value; determining the carbon isotope value of 1,7-DMP by gas chromatography-isotope ratio mass spectrometry, and calculating the logarithm value with 2 as the base, and the value is denoted as L value; constructing a two-dimensional identification chart by using the R value and the L value of standard samples with known sources; and finally, projecting the measured value of the sample to be measured into the chart, and identifying the source type of the parent material according to the region where the sample falls. The stable carbon isotope information and the molecular distribution information of 1,7-DMP are combined, the defects that the traditional biomarkers are interfered by thermal maturity and biodegradation are effectively overcome, different organic parent materials such as aquatic algae, angiosperms, herbaceous plants and gymnosperms can be finely distinguished, and a reliable technical means is provided for oil-source correlation under complex geological conditions.