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Polymer alloy with nano-scale disperse phase dimension and preparation method thereof

A nano-scale dispersed phase and polymer technology, applied in the field of new polymer materials, can solve problems such as large technical limitations and special equipment requirements, and achieve good application prospects

Inactive Publication Date: 2014-04-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a polymer alloy with a nano-scale dispersed phase and a preparation method thereof, aiming to solve various problems such as special equipment requirements and large technical limitations in the preparation of general polymer nano-alloys. The various nano-alloys prepared still maintain the macroscopic form of the raw material crystalline polymer, can be directly used in various molding processes, and have good application prospects

Method used

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Experimental program
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preparation example Construction

[0037] A kind of preparation method of the polymer alloy provided by the present invention has nano-scale dispersed phase structure comprises the following steps:

[0038] 1) Add one or more of crystalline polymers, α-olefin monomers, multifunctional monomers, surfactants and initiators into the reactor with water as the medium according to the stated ratio, and within 15 Uniform dispersion at ~97°C;

[0039] 2) Add the remaining components and keep at 15-97°C for 0.5-6 hours to complete the diffusion-polymerization process;

[0040] 3) Separating and removing the liquid in the system, washing and drying the solid to obtain a polymer alloy with a nano-scale dispersed phase.

[0041] The following examples will further illustrate the present invention:

Embodiment 1

[0042] Example 1: In a 250ml there-necked flask with a stirrer and a reflux condenser, add 20g of homopolypropylene (trade name: S1003, counted as 100 parts by weight) particles, 60ml of deionized water, and 1% styrene equivalent weight of polyvinyl alcohol as a dispersant, and then the three-necked bottle was placed in a constant temperature water bath at 90°C for stirring. After the temperature was stabilized, 30 parts by weight of styrene monomer was added, and the system was kept at 2 hours before adding a relative monomer weight of 5 % of benzoyl peroxide is used as an initiator to initiate polymerization, and the polymerization time is 2hr. After the polymerization is completed, the particles in the system are separated and dried by filtration. The particle product obtained under this condition is PP / PS nano-alloy. Observation by electron microscope proves that the homopolypropylene in the alloy is the continuous phase, and the polystyrene is the dispersed phase. The aver...

Embodiment 2

[0043] Embodiment 2: except that homopolypropylene is changed into the copolypropylene (trade name: M600) of equal weight, polyvinyl alcohol is changed into 5% of styrene, initiator benzoyl peroxide is changed into 3% of styrene weight. Except ammonium sulfate, all the other formulas and steps are identical with embodiment 1. The average size of the dispersed phase in the obtained nano-alloy is 60nm and it is spherical.

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Abstract

The invention discloses a polymer alloy with a nano-scale disperse phase dimension and a preparation method thereof, belonging to the technical field of new polymer materials. The polymer alloy is prepared through a diffusion-polymerization process with water as a medium by taking a crystalline polymer as a matrix in the presence of an alpha-olefin monomer, a multifunctional monomer, a surfactant and an initiating agent. The microscopic morphology in the polymer alloy prepared by the method has a sea island structure, and has the morphological characters that disperse phases are generally in the ball shape or similar to be in the ball shape and the phase average dimension is 10-200 nm. The prepared polymer alloy basically keeps the macroscopic morphologies including particle, powder or sheet of the raw material, namely the crystalline polymer, can be directly used for various molding processing, and has good application prospects.

Description

technical field [0001] The polymer alloy and its preparation method involved in the invention belong to the technical field of new polymer materials. Background technique [0002] Using different methods to prepare nano-alloys containing two or more polymers to obtain excellent comprehensive properties has been a hot technical issue in the field of polymer materials for more than two decades. Compared with the phase size of the dispersed phase in general polymer alloys, which is hundreds or even thousands of nm, although people define the alloy with the phase size of the dispersed phase less than 100 nm as an ideal polymer nano-alloy, in reality Due to the large dispersion and poor stability of the phase size of the dispersed phase in nano-scale alloys, people usually call the alloy with the phase size of the dispersed phase in the range of 10-200nm nano-alloys. Such a small size of the dispersed phase can often give Alloys bring about excellent or special properties. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/08C08F220/14C08F212/08C08F212/36C08F222/14C08F220/18C08F2/24
Inventor 于建郭朝霞姚雪容陈放邱海悦
Owner TSINGHUA UNIV
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