Nature is a very important source for polymer production industry. Most polymers are also produced artificially. One of these nature-sourced thermoplastic polymers are cellulosics. In here, we explained the properties and applications of cellulosic polymers.
As you understand from its name, the natural source of cellulosics is Cellulose(C6H10O5). There is no exact use of this natural polymer called as Cellulose. The first process is applied to cellulose to obtain ‘regenerated cellulose’ is dissolving cellulose and reprecipitating it.
Cellulose can not said of thermoplastic material, because they do not show thermoplastic behaviour. Cellulose decomposes upon heating, in which melting for turning back is not possible. With some additives, thermoplastic polymers can be produced from cellulose. Cellulose-acetate(CA) and cellulose-acetate-butyrate(CAB) are the most important products that are produced in this way. CA is generally used to obtain film-like products. CAB shows better performance in molding. CA is superior over CAB in terms of strength to dynamic loadings, lower moisture absorbtion and use of plasticizers.
Cellulose sourced polymers can be used for apparel production and these types of cellulosics called as ‘rayon’. ‘Cellophane’ is an another type of cellulosic that packaging materials are produced from it.
Glass transition temperature of cellulosics is around 105C and exact melting temperature of cellulosics around 305C. The production process of cellulosics is generally step polymerization. Cellulosics are generally amorphous polymers and has no any degree of crystallinity. Elongation of cellulosics ranges between 10-50% Modulus of elasticity of cellulosics around 2800 MPa and tensile strength of cellulosics is around 30 MPa.
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