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A separation membrane comprising a polyether polymer having a weight-average molecular weight of 104to 107and obtained by polymerizing an oxirane compound of the formula (a): wherein R is a hydrogen atom; an alkyl group, an alkyl group having a halogen atom, or --CH2O(CH2CH2O)k--R' (R' is a gr

A separation membrane comprising a polyether polymer having a weight-average molecular weight of 104to 107and obtained by polymerizing an oxirane compound of the formula (a): wherein R is a hydrogen atom; an alkyl group, an alkyl group having a halogen atom, or --CH2O(CH2CH2O)k--R' (R' is a group selected from an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group and an aralkyl group; k is from 0 to 12); or an ethylenically unsaturated group, a reactive silicon-containing group or a methylepoxy-containing group, is excellent in mechanical strength and flexibility.

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A separation membrane comprising a polyether polymer having a weight-average molecular weight of 104to 107and obtained by polymerizing an oxirane compound of the formula (a): wherein R is a hydrogen atom; an alkyl group, an alkyl group having a halogen atom, or --CH2O(CH2CH2O)k--R' (R' is a gr

A separation membrane comprising a polyether polymer having a weight-average molecular weight of 104to 107and obtained by polymerizing an oxirane compound of the formula (a): wherein R is a hydrogen atom; an alkyl group, an alkyl group having a halogen atom, or --CH2O(CH2CH2O)k--R' (R' is a group selected from an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group and an aralkyl group; k is from 0 to 12); or an ethylenically unsaturated group, a reactive silicon-containing group or a methylepoxy-containing group, is excellent in mechanical strength and flexibility. claim 3 characterized in that there is a gas absorbing module which is of cassette form and convenient to replace. 11. A method for separating desired materials from a gas, the method comprises: (i) providing a device comprising a collection chamber with grounded outer walls, at least one collection surface disposed within the collection chamber, an electrically insulated handle attached to the at least one collection surface, and ion yield tips; (ii) directing air flow through the collection chamber; (iii) applying a voltage between the ion yield tips and the at least one collection surface; (iv) collecting the desired material upon the at least one collection surface; (v) separating and manually removing the at least one collection surface from the device by grasping the electrically insulated handle; and (vi) enveloping the at least one collection surface with a protective bag while removing the at least one collection surface. 12. The method of claim 11, further comprising: (vii) disposing of the at least one collection surface; and (viii) introducing a new at least one collection surface into the device.