Entmischungsverhalten von Ethylen und niedermolekularem Polyethylen

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Abstract
The reciprocal solubility of ethylene and polyethylene‐wax was determined at temperatures from 383 to 473 K under pressures up to 200 MPa. Besides the cloud curve, the shadow and the coexistence curves have been measured. The miscibility gap is present in the whole range of concentration for pressures under 65 MPa. The heterogeneous region increases slightly with rising temperature, the critical curve remains practically unchanged with varying temperature. The solubility of ethylene in the polymer could be described with good accuracy on the bases of Henry's law and the theory of Flory‐Huggins for solutions of polymers. This description can be made by means of a simple expression for the temperature and pressure dependency of Flory's parameter. The phase behaviour of the investigated system is compared with experimental measurements and with those of other authors carried out on mixtures with ethylene and alkanes having lower molecular weights.

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