How two non polar groups interact?

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Yuri Mirgorod

The answer to your question, you can read in our article

Mirgorod Yu.A., Dolenko T.A. Liquid Polyamorphous Transition and Self-Оrganization in Aqueous Solutions of Ionic surfactant.// DOI:10.1021/acs.langmuir.5b00479.2015.

In simple explanation hydrophobic interaction involves a three contributions hydrocarbon / hydrocarbon, hydrocarbon / water and water / water.

Best regards.

Rudolf A. Lutz

Look up about Van der Waals Forces e.g. in the internet!

Angelo Mark P Walag

London Dispersion Forces of attraction. Check out Van Der Waals