Comparison of Formation Mechanism of Nanocapsules Through Miniemulsion Polymerization in the Presence or Absence of N-Isopropyl Acrylamide

Chem. J. Chinese Universities

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Comparison of Formation Mechanism of Nanocapsules Through Miniemulsion Polymerization in the Presence or Absence of N-Isopropyl Acrylamide

CAO Zhi-Hai, SHAN Guo-Rong*

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China

Received:2007-05-28 Revised:1900-01-01 Online:2008-01-10 Published:2008-01-10
Contact: SHAN Guo-Rong

Abstract

Abstract: According to the morphologies of latexes with and without the crosslinking agent, the escape of hydrocarbon which can be suppressed by the introduction of some amounts of crosslinking agent was considered as the main reason to form small solid particles. On the basis of these results, the comonomer, N-isopropyl acrylamide, was introduced in the system for synthesis of nanocapules through miniemulsion polymerization with liquid hydrocarbon as the template. The oligomers of poly(N-isopropyl acrylamide)(PNIPA) which can be dehydrated and separated from aqueous phase at polymerization temperature were adsorbed by the mini-droplets. Due to the thermodynamic force and electrostatic interaction, the oligomer radicals of PNIPA anchoring at the interface of droplets make the interface to be the loci of polymerization. Monomers diffused from the interior of droplets to supply for further polymerization. The nanocapsules can be obtained through the encapsulation of hydrocarbon by the newly-produced polymers separated at the interface of droplets. The mechanisms of formation of nanocapsules in the system with or without NIPA were compared.

Key words: N-Isopropyl acrylamide(NIPA), Crosslink, Miniemulsion polymerization, Nanocapsule

CLC Number:

O631

TrendMD:

CAO Zhi-Hai, SHAN Guo-Rong*. Comparison of Formation Mechanism of Nanocapsules Through Miniemulsion Polymerization in the Presence or Absence of N-Isopropyl Acrylamide[J]. Chem. J. Chinese Universities, doi: .

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Comparison of Formation Mechanism of Nanocapsules Through Miniemulsion Polymerization in the Presence or Absence of N-Isopropyl Acrylamide

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