Preparation of asymmetric polymer film by emulsion blend technique

Okubo, Masayoshi; He, Yuan; Ichikawa, Keita

doi:10.1007/bf01410676

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Similar asymmetric distribution of particles across the thickness of a latex blend film has been reported by Okubo et al 28,29 on latex blends prepared from poly(butyl acrylate) (PBA) and poly(ethyl acrylate-methyl methacrylate) (P(EA-MMA)) copolymer, with large PBA particles (tacky) at the glass/polymer interface and small P(EA-MMA) particles (non-tacky) at the air/polymer interfaces. This uneven distribution of two dissimilar particles, attributed to disparity in latex storage stabilities in the blends, was deduced indirectly from tackiness measurement.…”

Section: Morphology Of Nr/pmma Latex Blend Filmssupporting

confidence: 75%

Surface morphology of asymmetric latex film prepared from blends of natural rubber and poly(methyl methacrylate) latexes

Khew

Liew

2001

Surface & Interface Analysis

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Colloidally stable latex blends of natural rubber (NR) and poly(methyl methacrylate) (PMMA) latexes containing up to 50 wt.% PMMA can be prepared by mixing commercial NR ammoniated latex concentrate and monodisperse PMMA latex dispersion. The clarity and tackiness of the films obtained depend on the PMMA content; films become opaque and non-tacky at >30 wt.% PMMA content. The morphology of these films shows asymmetric distribution of the PMMA particles across the thickness of the film. There is preferential enrichment of PMMA particles at both the air/polymer and glass/polymer interfaces and a predominating NR interior. More PMMA particles are accumulated preferentially at the glass/polymer interface than at the air/polymer interface. The accumulation of the PMMA particles at the interface is strongly dependent on the size and concentration of the PMMA particles. The formation of these asymmetric latex films is explained in terms of the surface energetics, compatibility, T g and density of the polymers, stability of the component latex, surface chemistry and particle size of the latex particles used. Copyright  2001 John Wiley & Sons, Ltd. KEYWORDS: asymmetric latex film; natural rubber latex; poly(methyl methacrylate) latex; latex blend film morphology; natural and synthetic latex blend INTRODUCTIONSynthetic latexes are used extensively in the paints and coating industry. This application requires the latex particles, on drying, to form a continuous film. However, good filmforming latex lacks mechanical strength in its film. Thus, low-T g latexes have good film-forming abilities but the films possess a low Young's modulus. Various techniques have been used to overcome this problem. For example, filmforming aids frequently have been employed to provide a coherent film.1,2 Another approach is the synthesis of waterborne core/shell latex particles with a high-T g polymer core and a film-forming shell that are able to form a film of elastomeric matrix containing a high-modulus inclusion.3,4 Another technique is by physically blending two polymer latexes with different T g values 2,5 in which the soft particles deform and fill the voids between the hard particles. A blend of a low-T g latex with a high-T g polymer is used in latex-based impact modifiers for polymer resins. In polymer blending, one anticipates obtaining different properties in the blend than those of the individual polymer components. Although polymer blending 7 has been studied for many years, much less attention has been paid to synthetic latex blends. One of the main interests in latex blends is the drive towards zero-volatile organic compounds in the organic coating industry.2 Analysis of morphology and transparency of latex blend films by atomic force microscopy (AFM) and scanning electron microscopy (SEM) has provided insight into the interaction between hard and soft latex particles.8 -10 Although diffusion at the particle/particle interface of miscible polymer components during film formation is studied extensively, 11 -15 little is known ab...

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Section: Morphology Of Nr/pmma Latex Blend Filmssupporting

confidence: 75%

Surface morphology of asymmetric latex film prepared from blends of natural rubber and poly(methyl methacrylate) latexes

Khew

Liew

2001

Surface & Interface Analysis

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“…In our previous study,13 it was found that two‐layer emulsion films could be prepared from blend emulsions, in which two kinds of polymer particles having different colloidal stabilities were dispersed. In previous studies,14, 15 the influences of the particle sizes and amounts of surfactant on the formation of the two‐layer structure were examined in detail.…”

Section: Introductionmentioning

confidence: 99%

Preparation of two‐layer film having porous structure by emulsion blend technique

Okubo

Terada

Kagawa

2003

J of Applied Polymer Sci

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A two-layer film consisting of a tacky layer (air side) and a porous nontacky layer (release-paper side) was prepared by casting blend emulsion on a release paper, in which 150-nm 2-ethylhexyl acrylate-2-methoxyethyl acrylate-acrylic acid terpolymer particles having high storage stability and 542-nm ethyl acrylate-methyl methacrylate copolymer particles having low storage stability were dispersed. Both emulsion particles were produced by emulsifier-free emulsion copolymerizations. The difference of tackiness between both surfaces increased with increases in the film-formation time and the concentration of electrolytes in the blend emulsion, and resulted in the two-layer film. The film had a high water vapor permeability, which is also needed for medical adhesive tape.

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Preparation of a heterogeneous polymer film from the blend emulsion by the stepwise heterocoagulation method

Okubo¹,

Lu²

1999

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Preparation of asymmetric polymer film by emulsion blend technique

Cited by 3 publications

References 2 publications

Surface morphology of asymmetric latex film prepared from blends of natural rubber and poly(methyl methacrylate) latexes

Surface morphology of asymmetric latex film prepared from blends of natural rubber and poly(methyl methacrylate) latexes

Preparation of two‐layer film having porous structure by emulsion blend technique

Preparation of a heterogeneous polymer film from the blend emulsion by the stepwise heterocoagulation method

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