Counterion design of TEMPO-nanocellulose used as filler to improve properties of hydrogenated acrylonitrile-butadiene matrix

摘要

1. The TOCN-Na/H-NBR (TOCN/H-NBR = 5(100, wlw) composite film has a high Young's modulus of -63 MPa, whereas that of the neat H-NBR film of 5.3 MPa. 2. The storage elastic modulus of neat H-NBR is 2 MPa, and it increases to 112 MPa for the TOCN-Na/H-NBR (TOCN/H-NBR = 5/100, w/w) composite film. 3. The CTE value significantly decreases from 2660 ppm/K for the neat H-NBR film to 70-120 ppm/K for the TOCN-Na/H-NBR (TOCN/H-NBR = 2-5/100, w/w) composite films. 4. These effects of TOCN-Na are likely caused by formation of network structures of TOCN-Na elements in the H-NBR matrix. TEM images support formation of grid-like network structures of TOCN-Na elements surrounding the H-NBR latex particles, which is caused by phase separation between the hydrophilic TOCN-Na elements and the hydrophobic H-NBR particles. 5. The Young's modulus and work-of-fracture decrease in the order Li~+ > Me_4N~+ > Et_4N~+ > n-Bu_4N~+, while the hydrophobic TOCN-NR_4/H-NBR films have low CTE values <100 ppm/K.