Determine the weight fraction of $1,4PBD$ in the

$1,2PBD$ domains for the $1,4$PBD$-$block$-1,2$PBD

$($green trace$)$ diblock copolymer. Use the $T_g$

values and DSC plot below to answer the

question, $T_{g,\text{T}\text{o}\text{t}\text{a}\text{l}}=-19C,T_{g,1,4PBD}=-89C,$ and

$T_{g,1,2PBD}=3C.$