ISSN:
0887-6266
Keywords:
acrylic
;
latex blends
;
biphasic films
;
film formation
;
mechanical properties
;
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The film-forming ability of latex blends (hard latex + soft latex) and the mechanical behavior at finite strain of latex blend films (soft matrix with tough inclusions) has been investigated. The maximum weight fraction of hard latex particles (φmax) which still gives rise to transparent and crack-free films has been used as film-forming ability criterion. It was shown that when the Tg of the soft latex is low (Tg(soft) 〈 0°C), φmax is constant and equal to 0.55 because the film-forming ability is controlled by contacts between hard particles. Nevertheless, the expected effect of Tg(soft) on film-forming ability is observed (i.e., φmax decreases when Tg(soft) increases) when Tg(soft) is above 0°C. From the mechanical behavior point of view, it was shown that the two main parameters controlling the mechanical behavior of latex blend films are: the mechanical properties of the soft polymer because it represents the continuous matrix and the weight fraction of hard latex particles since they enhance the local deformation of matrix under load. However, it was also proven that debounding between the Tg latex particles and low Tg matrix occurs rapidly (at an elongation ratio ≈ 30%) during uniaxial strain experiments and has to be taken into account in order to gain a thorough understanding of the mechanical behavior of these biphasic films. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2093-2101, 1997
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
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