29) Polyethylene can be obtained in two different forms. High-density polyethylene (0.94 g/cm3 is a linear polymer. Low-density polyethylene (0.92 g/cm3) is a branched polymer with short side-chains...

Extracted text: 29) Polyethylene can be obtained in two different forms. High-density polyethylene (0.94 g/cm3 is a linear polymer. Low-density polyethylene (0.92 g/cm3) is a branched polymer with short side-chains on 3% of the atoms along the polymer chain. What could be the reason of the change in the polymer density difference? 30) Which of the below given characterization technique can be used to identify the surface chemistry of a biomaterial? а) ТЕМ b) XPS c) TGA d) DTA 31) Sort the wettability for the given surfaces based on the given contact angle values ( non- wetting, good wetting, incomplete wetting ? a =90 a <90 a="">180