In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Product Details of 18959-30-3, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 18959-30-3, name is 4,5-Difluorophthalic Anhydride. In an article，Which mentioned a new discovery about 18959-30-3
A series of thermosetting polyimide oligomers with different diamines (isomers) and same calculated number-average molecular weights (Mn) were synthesized with BPDA (biphenyl-tetracarboxylic acid dianhydride), 4,4?-ODA (4,4?-oxydianiline), 3,4?-ODA (3,4?-oxydianiline) and 4-PEPA (4-phenylethynylphthalic anhydride). Herein, we investigate the effect of monomer configuration on the mechanical, thermal and tribological properties of thermosetting polyimides. Experimental results demonstrate the relationship between molecular configuration and mechanical, thermal and tribological properties. It is revealed that as the content of 4,4?-ODA increases, Tg, Young’s modulus and hardness increases and coefficient of friction (COF) and wear rate (WR) decrease under most conditions. Compared with variations of COFs and WRs of TPIs to velocity or load, it is easy to confirm the major influencing factor under different conditions.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H2972O – PubChem