Hello 

The PMMA XRD pattern gives 2theta peaks at 13°, 27° and 41°. If you have these peaks in  your XRD pattern of your sample then it's PMMA otherwise else. 

PVDF containing 2 theta XRD peaks at 17.6° or 17.88° 18.2 or 18.50°, 19.8° or 20.05° and 26.2° respectively. 

CNTs peak observed at 20°-30°, 40°-45° corresponds to CNTs 

For JCPDS no of PMMA  go through this paper 

http://rspublication.com/ijst/2014/feb14/61.pdf

For JCPDS no of PVDF

 go through this paper

http://pubs.rsc.org/en/content/articlepdf/2015/cp/c5cp02753e?page=search

For JCPDS no of CNTs

go through this paper

http://przyrbwn.icm.edu.pl/APP/PDF/123/a123z2p038.pdf