Ultra-branched polymer used as polythene processing auxiliary agent and synthetic method

A technology of hyperbranched polymers and processing aids, which is applied in the field of hyperbranched polymers and can solve problems such as low molecular weight, single structure, and high cost

Active Publication Date: 2007-09-12
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the hyperbranched polymers used to improve the processing fluidity of polymers in all domestic published patents are polycondensates such as polyesters and polyamides, which have the disadvantages of single structure, low molecular weight, and high cost.
For example, CN1488668 adopts 1%~10% hyperbranched polyester-amide to blend with ultrahigh molecular weight polyethylene with a molecular weight of 1 to 3 million. It is found that the melt viscosity of ultrahigh molecular weight polyethylene can be significantly reduced, but the adopted method is not given. Synthetic method of hyperbranched polymer
However, there are no relevant patents on the use of hyperbranched polymers synthesized by the ATRP method with milder conditions to improve the processing fluidity of polyethylene.

Method used

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  • Ultra-branched polymer used as polythene processing auxiliary agent and synthetic method

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Embodiment 1

[0018] 5.08g (0.0333mol) of p-chloromethylstyrene, 39.96g (0.167mol) of lauryl acrylate, 34.66g (0.3333mol) of styrene, 0.495g (0.005mol) of cuprous chloride, and 1.56 g of bipyridine g (0.01mol) was added to a 250mL round-bottomed flask, and reacted at 110°C for 8 hours under magnetic stirring. Dry under vacuum for 48 hours to obtain the target hyperbranched polymer (HBP), with a yield of 75%. hyperbranched polymer 1 The H-NMR figure is shown in accompanying drawing 1, according to 1 The H-NMR chart calculates that the molar content of lauryl acrylate structural unit in the copolymer is 30%, which is close to the monomer composition of 31.3% when feeding. The product was determined by gel permeation chromatography (GPC). w，GPC =9.4×10 4 , M n，GPC =3.4×10 4 , M measured by multi-angle laser light scattering (MALLS) w，MALLS =1.3×10 5 . The absolute weight-average molecular weight measured by light scattering is significantly greater than the relative weight-average mol...

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Abstract

This invention relates to a hyperbranched polymer used as polythene processing assistant and its synthesis method, specifically the Polymer composed of higher alcohol of acrylic ester and styrene and the method of atom transfer radical polymerization. The invention synthesizes the hyperbranched polymer firstly through the following formula (weight): p-CMS 1, styrene 6.84~13.68, acrylic dodecyl alcohol ester 7.88~23.64, Bpy 0.21~ 0.63, CuCl 0.065~0.196. The above components conduct evacuation, filling argon or nitrogen for more than five times, closing tightly, and response under magnetic stirring for four to twelve hours and 100~130deg.C. The product is dissolved in acetone, filtered in alumina column, precipitated in ethanol, and dried in vacuum for a few hours under 25~40deg.C to obtain the hyperbranched polymers. The melt viscosity of this invention decreases significantly corresponding to pure HDPE, and its strength change is very small showed by the tensile performance test.

Description

technical field [0001] The invention relates to a hyperbranched polymer that can be used as a polyethylene processing aid and a synthesis method thereof, in particular to a hyperbranched polymer composed of high-carbon alcohol acrylate and styrene and its use of atom transfer radical polymerization synthetic method. Background technique [0002] In the past 20 years, hyperbranched polymers (Hyperbranched polymers) have been widely concerned in the polymer academic and industrial circles. It refers to polymers with no obvious main chain in the molecule but rich branched structures and surface functional groups. Hyperbranched polymers have approximately spherical three-dimensional molecular structures, few intermolecular and intramolecular chain entanglements, and low solution and melt viscosities. Therefore, it has broad application prospects in high-solid coatings, drug and catalyst carriers, rubber and plastic processing aids, etc. (Yan D, Prog. Polym. Sci., 2004, 29, 183)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/16C08K5/3432C08L23/06C08F212/08C08K3/16
Inventor 蒋必彪任强
Owner 溧阳常大技术转移中心有限公司
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