MONOMOLECULAR FILMS OF COPOLYMERS OF OXYETHYLENE AND OXYPROPYLENE, POLYPROPYLENE GLYCOL AND THEIR BINARY MIXTURES

LI Wailang; DING Faxiang; GU Tiren

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MONOMOLECULAR FILMS OF COPOLYMERS OF OXYETHYLENE AND OXYPROPYLENE, POLYPROPYLENE GLYCOL AND THEIR BINARY MIXTURES

Papers | Updated：2021-06-21

- MONOMOLECULAR FILMS OF COPOLYMERS OF OXYETHYLENE AND OXYPROPYLENE, POLYPROPYLENE GLYCOL AND THEIR BINARY MIXTURES
- Vol. 7, Issue 2, Pages: 119-123(1989)
- Affiliations：
  
  1. Department of Chemistry and Institute of Physical Chemistry, Peking University,Beijing
  2. Peking University
  3. Beijing
- Author bio：
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LI Wailang, DING Faxiang, GU Tiren. MONOMOLECULAR FILMS OF COPOLYMERS OF OXYETHYLENE AND OXYPROPYLENE, POLYPROPYLENE GLYCOL AND THEIR BINARY MIXTURES. [J]. 7(2):119-123(1989)
DOI：

LI Wailang, DING Faxiang, GU Tiren. MONOMOLECULAR FILMS OF COPOLYMERS OF OXYETHYLENE AND OXYPROPYLENE, POLYPROPYLENE GLYCOL AND THEIR BINARY MIXTURES. [J]. 7(2):119-123(1989) DOI：

摘要

<正> The behaviour of monolayers of copolymers of oxyethylene and oxypropylene （UH29 and UH68）, polypropylene glycol （UHPPG）and their binary mixtures on air-water interface has been investigated carefully on compression-expansion cycles. The first compression isotherm is approximately an equilibrium one. In the UHPPG-UH29 and UHPPG-UH68 systems, the calculated average π-a curves based on simple additivity of the two individual components coincide with the experimental results reasonably well. It is suggested that the two components are miscible and form near-ideal solution at the air-water interface. The compression-expansion cycle experiments shows some degree of hysteresis. The order of degree of hysteresis for individual components is UH68>UH29>UHPPG. The explanation for the hysteresis is proposed.

Abstract

The behaviour of monolayers of copolymers of oxyethylene and oxypropylene （UH29 and UH68）, polypropylene glycol （UHPPG）and their binary mixtures on air-water interface has been investigated carefully on compression-expansion cycles. The first compression isotherm is approximately an equilibrium one. In the UHPPG-UH29 and UHPPG-UH68 systems, the calculated average π-a curves based on simple additivity of the two individual components coincide with the experimental results reasonably well. It is suggested that the two components are miscible and form near-ideal solution at the air-water interface. The compression-expansion cycle experiments shows some degree of hysteresis. The order of degree of hysteresis for individual components is UH68>UH29>UHPPG. The explanation for the hysteresis is proposed.

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