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Chemistry and Industry of Forest Products ›› 2021, Vol. 41 ›› Issue (4): 42-50.doi: 10.3969/j.issn.0253-2417.2021.04.007

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Preparation and Characterization of Room Temperature Vulcanized Silicone Rubber Cross-linked by TiO2 Modified Dehydroabietic Acid

Xinxin YANG1,2(), Zhaoyu JIANG2, He LIU2, Xujuan HUANG1, Zhaosheng CAI1,*(), Shibin SHANG2   

  1. 1. School of Chemical and Chemistry, Yancheng Institute of Technology, Yancheng 224051, China
    2. Institute of Chemical Industry of Forestry Products, CAF, Nanjing 210042, China
  • Received:2020-10-14 Online:2021-08-28 Published:2021-08-31
  • Contact: Zhaosheng CAI E-mail:yangxx0316@163.com;jsyc_czs@163.com


Dehydroabietic acid(DA) reacted with 3-glycidyloxypropyltriethoxysilane(GTS) to synthesize dehydroabietic acid-based cross-linking agent(DAG), and then DAG was combined with TiO2, catalyst dibutyltin dilaurate, and hydroxyl polysiloxane(PDMS) to fabricate the TiO2 modified dehydroabietic acid cross-linked the room temperature vulcanized silicone rubber(TiO2-DAG/RTVSR). The microscopic morphology, mechanical properties, thermal stability, and hydrophobicity of the samples were investigated. The results showed that DAG and TiO2 were uniformly dispersed in the dehydroabietic acid cross-linked silicone rubber. Compared with DAG/RTVSR-3 obtained by only adding DAG, when the addition of TiO2 was 7%, the tensile strength of the obtained TiO2-DAG/RTVSR-4 increased from 0.65 MPa to 0.98 MPa which increased by 50.8%, and the elongation at break increased from 250% to 317%.The 5% mass loss temperature of silicone rubber increased from 324.5℃ to 338.8℃ as the addition of TiO2 increased from 0% to 7%; and the swelling degree decreased, which indirectly reflected the increase in the degree of cross-linking.The contact angle gradually decreased with the increasing of TiO2 amount. These results indicated that the synergistic effect of dehydroabietic acid with rigid structure and TiO2 into the molecular chain of silicone rubber could effectively enhance the mechanical properties and thermal stability of room temperature vulcanized silicone rubber.In summary, silicone rubber with 7% TiO2 had the best performance.

Key words: rosin derivatives, nanoparticles, synergistic effect, mechanical properties, thermal stability

CLC Number: