$($a$)$ Three statistical P$($IBA$-$co$-$nBA$)$ copolymers with IBA$/$nBA weight fractions of $\frac{79}{21},\frac{53}{47},$ and $19/81$

have been produced. Using the experimental DSC thermograms, estimate the $T_g$ of the statistical

copolymers and parent homopolymers $-$ poly$($isobornyl acrylate$)($PIBA$)$ and poly$($n$-$butyl acrylate$)($PnBA$).$

Report the data as shown in the table below.