Alejandra Tapia Sierra

6 Questions 11 Answers 0 Followers

Questions related from Alejandra Tapia Sierra

Can I add something to the deionized water during washing chitin to obtain faster a neutralized chitin?

I am trying to obtain chitin by a chemical method. After deproteinization and demineralization processes, the powder obtained after each step is too alkaline or acidic respectively. Then, I spend...

11 July 2022 1,723 3 View

What would happen if the product of deproteinization is not neutralized in the chitin extraction?

Hello I am trying to obtain chitin from crab. I haven't neutralized the product of deproteinization step but I have spent a lot of water. Is it necessary to reach a 7 pH before starting...

08 March 2017 1,466 1 View

Can a polymer increase at first and then decrease his weight when it is inmersed on water?

How can this be possible? which conditions or modifications can change the polymer behavior on water?

01 February 2016 7,008 10 View

How can I calculate the stoichiometric amount of Formaldehyde and KOH that I need to achieve 60mol% degree of crosslinking on Polyvinyl alcohol?

Hello, I need to know the amount of reagents for crosslinking on PVA Thanks

29 October 2015 6,176 4 View

What solvent can I use to solubilize the SEBS block copolymer (different to dichloroethane) ?

I need to make the casting of the copolymer of styrene-ethylene-butylene-styrene ( SEBS ) and I wonder what I could use as solvent (different to dicloroethane)

24 March 2015 8,267 6 View

Where in structure of block copolymer (like SEPS or SEBS) is grafted the maleic anhydride by reactive extrusion?

I need to draw the structure of SEPS with maleic anhydride graft.

27 January 2015 2,830 2 View