method for using a coupling agent such as dcc dicyclohexyl carbodiimide or edc 1 ethyl 3 3 dimethylaminopropyl carbodiimide or a dean stark distillation method using a catalyst such as zr oac x oh y but is not limited thereto herein x and y have a correlation of x y 4 the norbornene monomer that is represented by formula 1 has two cinnamate groups and cannot be manufactured by using a known method but in the present invention the norbornene monomer that is represented by formula 1 can be manufactured by using the above method in addition the present invention provides a polynorbornene derivative including a repeating unit that is represented by the following formula 2 wherein p is an integer in the range of 0 to 4 x and y are the same as each other or different from each other and substituted or unsubstituted c 1 20 alkylene carbonyl carboxy and substituted or unsubstituted c 6 40 arylene n is an integer in the range of 50 to 5 000 a and b are an integer in the range of 0 to 5 and r1 and r2 are the same as each other or different from each other and each selected from the group consisting.