A new form of adhesion and separation technology has been developed. This is a revolutionary development in the industry, which makes it possible for bonded compound building materials to be separated by the simple application of heat after use and therefore to be adapted to recycling. Conventional building materials are bonded strongly to ensure they survive the stringent working conditions they are subjected in the living environment, so up to now they could not be separated easily after use and had to be disposed of mainly as controlled waste. The developed technology is characterized by compatibility between durable bonding in the living environment and easy separation after use. This characteristic is realized by the interaction between the mixing and resultant composition of adhesive polymer and thermally-expanding functional materials. Heating over 100°C causes the adhesive polymer to soften, and at the same time the functional materials expand, resulting in loss of adhesion and thus enabling their easy separation. This article describes the principle and mechanism of separation, and gives examples of products developed by applying this technology.
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