Studies on blend polymers. mixing of cis‐ and trans‐ 1,4‐polybutadiene

Abstract

Synopsiscis-1,PPolybutadiene and trun-s-l,4polybutadiene were mixed at the ratio in weight of 100/0, 75/25, 50/50, 25/75 and 0/100, and various problems related to the mixing were studied. The mixing waa carried out by the three methods, i.e., (I) by rolling, ( 2 ) by filler batch polymer, and ( 3 ) by coprecipitation of the solution. For the mixed compound and vulcanized rubber, such characteristics aa the viscosity of the solution, the Mooney viscosity, x-ray diffraction, infrared spectra phase separation of the solution, tensile strength, and the swelling ratio in benzene were observed. No marked difference in the state of mixing waa noted, regardless of the method of mixing. However, the mixing of filler batch polymer waa accomplished more easily than by the rolling method.A 50/50 blend rubber waa microheterogeneous and contained particles about 0.5 p in length, but these did not affect the crystallization, as judged from the observation of the state of dispersion, by means of electron microscopy, x-ray diffraction, and infrared analysis. This waa revealed by comparing infrared spectra of extracts obtained from the unvulcanized portion after various vulcanization times. The Cis4 vulcanizate did not show any crystalline pattern even at 550% elongation.The lruns-4 polymer, vulcanized a t a much slower rate than C i s 4

Two‐phase polymer systems

“…The nature of the resulting dispersion depends on the length of mixing, the shear field in equipment, temperature, rheological properties of the component polymers, etc. (1,2,3,4,5,6) and it is almost impossible to exercise independent control of all these variables. Also, there is the possibility of chemical effects produced by the milling operation.…”

Study of relaxation behavior and processability of polybutadiene rubber composition

“…[7][8][9][10] Different compositions of PBR have also been explored by researchers, which influence their relaxation behavior. 11,12 Because of the unique combination of desirable properties, improved processabilities, and cost advantages, rubber blend are widely used for industrial purposes. 13 A significant amount of work is done on blend compositions of PBR/natural rubber (NR), PBR/SR, PBR/polyisoprene, PBR/polychloroprene, NR/PBR/SBR blends that discussed various enabling properties.…”

“…7 –10 Different compositions of PBR have also been explored by researchers, which influence their relaxation behavior. 11,12…”