news Optimization of STL sound transmission loss of tri(dimethylaminopropyl)hexahydrotriazine in sound-absorbing cotton of elevator car Optimization of STL sound transmission loss of tris(dimethylaminopropyl)hexahydrotriazine in sound-... 03/1938Optimization of STL sound transmission loss of tri(dimethylaminopropyl)hexahydrotriazine in sound-absorbing cotton of elevator car