Emulsifier‐free emulsion copolymerization of styrene with two different amino‐containing monomers: II. Surface and colloidal characterization

Abstract

ABSTRACT:The colloidal and surface properties of copolymer latex particles prepared by batch emulsifier-free emulsion polymerization of styrene with two different aminocontaining monomers (Amino Ethyl Methacrylate Hydrochloride (AEMH) and Vinyl Benzyl Amine Hydrochloride (VBAH)), and 2,2-azobis(2-amidinopropane) dihydrochloride (V50) as initiator were investigated. The final particle size was found to decrease with increasing the functional monomer concentration. Different titration methods were used to quantify the surface amino (brought by the monomer) and amidino groups (originated from the initiator) on the latex particles. The same behavior was observed on both type of latexes: increasing the functional monomer concentration caused the surface amino groups density to increase from 0 to a plateau value at 8.2 mC/cm 2 , whereas the surface amidino groups density decreased from 18.5 to 2 mC/cm 2 . These results were confirmed by electrophoretic measurements and they corroborated those obtained in a previous kinetic study (Part 1) concerning the role of functional monomers as transfer agents.

Amino covalent binding approach on iron oxide nanoparticle surface: Toward biological applications

“…The total percent of nitrogen present in the sample is 0.02% and by correlating with the amount of particles present in the sample, we found 2.2 mg/g (mg of amino function/g of particles). (See Supporting information for the calculation).To provide further evidence of the presence of amino groups on the surface of the iron oxide NPs, different method can also be used 33 . For this, the Hermanson's method was used (please refer to supplementary information).…”

Adsorption of Chitosan onto Poly(D,L‐lactic acid) Particles: A Physico‐Chemical Investigation

“…[14] The second method used an anionic dye which could interact with ammonium groups of chitosan via ion-pairing. In Figure 1, one can see a perfect correlation between both methods, proving that two independent methods led to identical results.…”

“…The fluorescence titration method was based on the reaction of fluorescamine [14] with the primary amino groups of chitosan leading to a fluorescent product.…”

Part 1 : Soap-Free Emulsion Copolymerization of Styrene with COPS-I

“…높은 표면전하를 가지는 라텍스는 전기적 반발력에 의 해 규칙적인 삼차원적 입자 배열성과 전기 영동성을 높 이고, 고분자의 큰 굴절률은 광결정의 반사율을 증가시 킨다 [9][10][11][12][13]. 무유화중합은 [14][15][16][17][18] 계면활성제의 첨가없이 이온성 개시제 또는 이온성 공단량체를 [4,9,10,11,[19][20][21][22][23][24] 사용하여 단분산성이 우수하고 높은 표면전하를 갖는 고분자 미립자를 제조하는 방법으로 최근에는 광학 또는 감지기능을 갖는 새로운 콜로이드 광결정 재료 [1][2][3][4][5][6][7] 제조에 사용되고 있다.…”