Thermic films

A summary of polymers and their blends used for greenhouse applications are presented in Table 5.1. The EVA/LDPE blends show superior UV resistance as compared to LLDPE or LLDPE/LDPE blends (50/50). Additionally, the EVA also serves as infrared or thermic barrier film. 

The PECVD or plasma polymerization represents a new technology that enables the production of thin films with manifold properties. Plasma polymerized layers are insoluble in organic solvents, indicative of the highly three dimensional crosslinked structure. The properties of such films can be influenced by parameters like pressure, flow rate, nature of monomer, carrier or reactive gases, power input, reactor configuration, substrate location, frequency (r.f. or microwave). In a "cold plasma" the particles are not in thermical equilibrium. The temperature of the electrons goes up to 10 °C, that of neutral particles and ions reaches about 300 C. The monomers get fragmented in the plasma and polymerize on the fibre surface. 

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