PET has a Young's, Modulus of 3.5 GPa and PLGA 1.2 GPa. A polymer blend is prepared with 40:60 mixture (PET:PlGA) . What is the Young's, Modulus of this blend (use mixture rule). Calculate the percent load borne by PET when the blend is subjected to a load. If after 10 days, half of PET and one third of PLGA had degraded, what is the Young's Modulus of this blend.
"Young's modulus=Y_{PET}=" 3.5 GPa, "Y_{GPA}= 1.2 GPa"
It has mixture of 50:50
"Y_m= \\frac {2}{5}Y_{PET} + \\frac {3}{5}Y_{GPA}"
"Y_m= \\frac {3.5\\times2}{5} + \\frac {3\\times 1.2}{5}"
"Y_m= 1.4+ 0.72= 2.12\\ GPa"
Let P be the load applied on blend mixture
Total elongation = elongation of 1 + elongation of 2
so here Youngs modulus for mixture after 10 days as per rule of degradation
"Y_m =" "\\frac{3.5}{2} +\\frac{1.2}{3}= 1.74 + .4= 2.14" GPa
This Youngs modulus after 10 days
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