Sangyub Oh

6 Questions 9 Answers 0 Followers

Questions related from Sangyub Oh

Can the -OH of hydrogen sulfate also react with isocyanate to form a urethane bond?

Can the OH of hydrogen sulfate also react with isocyanate to form a urethane bond?

08 April 2024 7,679 0 View

I have 2 questions about molar ratio in polyurethane synthesis ?

While reading papers on polyurethane synthesis, a question arose. Q1. MDI [methylene di(p-phenyl) isocyanate] 2mmol PTMO[poly(tetramethylene oxide)] 1mmol 1,4-butanediol 0.9mmol...

28 March 2024 2,681 2 View

Shouldn't linear polyurethane have an R ratio of 1:1?

In linear polyurethane, which is made by reacting isocyanate with two NCO and -diol with two OH, the R ratio (the ratio of NCO to OH), cannot theoretically deviate significantly from 1:1, right?

26 March 2024 4,442 8 View

I have a question about reactions between chemicals (hyaluronic acid, DTA) ???

It is said that dodecyl-trimethylammonium chloride (DTA) is used to dissolve hyaluronic acid (HA) in an organic solvent such as DMF. If the experiment is conducted using the method below, will...

24 March 2024 4,348 4 View

Is stannous octoate necessary when making polyurethane?

When making medical TPU using PCL, some papers use stannous octoate, while others do not. Is stannous octoate really necessary?

19 March 2024 8,561 3 View

Is the urethane bond between diol and isocyante broken by the solvent?

To make polyurethane, TPU pellets are melted with DMF or THF solvent. Q1. Is the urethane bond between diol and isocyante broken by the solvent? Q2. When the solvent is volatilized, a urethane...

17 March 2024 5,011 9 View