side chains decrease the contact between the molecules so vender waals forces become weaker and the material becomes weaker ..less dense and softerhttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_42.pdf
question 5 c(iv). Why can't we add a side chains ? Doesn't this increase van der waals force and so it becomes more rigid ?