If the polarity of the organoclay sufficiently matches the monomer or prepolymer，it will intercalate into the galleries,futher spreading clay layers apart.For long chain onium-exchanged organoclays,the galleries swollen by these precursors show a d-spacing indicative of a paraffin monolayer arrangement. This is what I read from an article.I got some questions to ask 1.I would like to know more about Organoclay-polymer,what is it actually? 2.What is "the galleries" which mentioned in the passage means? 3.What is d-spacing? Thank you!