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4) If the equilibrium swelling is lower in basic than acidic conditions then it is a 1 point cationic anionic non-ionic polyionic 5) which does not form a hydrogel 1 point PVP HA PEG PET 6) PET has a Young's, Modulus of 3.5 GPa and PLGA 1.2 GPa A polymer blend is prepared with 50.50 mixture (PET.PIGA) . What is the Young's, Modulus of this blend (use mixture rule) 1 point 7) Calculate the percent load borne by PET when the blend is subjected to a toad 1 point 8) If after 10 days, half of PET and one third of PLGA had degraded, what is the Young's Modulus of this blend 9) Natural fibre reinforced PMMA is prepared for a biomedical application. The modulus of the fibre and PMMA are 200 and 5 GPa respectively. In order to achieve 160 GPa modulus how much fibre should be added (volume \%) use mixture rule