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3020369 
Journal Article 
Studies on the ambient temperature crosslinking of latex films based on natural rubber grafted with poly(diacetone acrylamide) using DMTA 
Thongnuanchan, B; Ninjan, R; Kaesaman, A; Nakason, C 
2015 
Yes 
Journal of Polymer Research
ISSN: 1022-9760 
22 
6 
WOS:000355760900001 
The concept of crosslinking natural rubber (NR) latex particles bearing diacetone acrylamide (DAAM) functional groups with a hydrazide crosslinker during film formation has been investigated using dynamic mechanical thermal analysis (DMTA). First, graft copolymers of NR and poly(diacetone acrylamide) prepared using 5 and 10 wt% of DAAM (abbreviated as NR-g-PDAAM5 and NR-g-PDAAM10, respectively) were synthesized. Then the dynamic mechanical properties of the cast NR-g-PDAAM latex films were measured. Two separate peaks were observed in tan delta versus temperature. The first peak appeared at -62 degrees C, which corresponds to glass transition of the NR phase. The second peak at -23 degrees C for NR-g-PDAAM5 (-18 degrees C for NR-g-PDAAM10) was tentatively attributed to the characteristics of NR-g-PDAAM phase. Furthermore, a shift to higher temperature of the tan d peak corresponding to the NR-g-PDAAM phase was observed in the NR-g-PDAAM latex films, when adipic acid dihydrazide (ADH) was added prior to film casting. The added ADH increased the thermal energy required for molecular mobility in the NR-g-PDAAM phase of the cast film, providing evidence of crosslinking between the DAAM functional groups and the ADH during film formation. 
Graft copolymers; Natural rubber; Diacetone acrylamide; Latex film