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Questions related from Billa Narasimha Rao
While calculate Volume shrinkage of sealants, I need to weigh the sample in air and test liquid. Can you please suggest how to weigh in test liquid? What kind of set is required? Please suggest....
15 May 2021 6,236 0 View
How can we improve the impact resistance of polyurethanes? Which isocyanate will be better? Thank you for valuable time?
19 July 2019 7,217 6 View
does shape memory polymers are sub class of stimuli responsive polymers?
30 November 2018 9,808 3 View
does shape memory polymers comes under responsive polymers? how to distinguish shape memory polymers and responsive polymers?
30 November 2018 9,038 1 View
Dear all, Can you please share, if you come across any reports on the degradation kinetics of PEG based polyurethanes in PBS? Polyurethanes of PEG/PCL? and TDI/ MDI/ IPDI? Thanking you in advance...
29 May 2018 3,371 5 View
Dear all, Can you please share, if you come across any reports on the degradation kinetics of PEG based polyurethanes in PBS? Polyurethanes of PEG/PCL? and TDI/ MDI/ IPDI? Thanking you in...
23 May 2018 2,999 1 View
Dear all, I want to study the thermo mechanical properties(like cyclic shape memory test and/or stress-strain-temperature diagram)of my shape memory polyurethane elastomers. But I could give a...
11 December 2017 3,490 3 View
Dear all, I am looking for a procedure to calculate the amount of isocyanate required to make PEG/PCL based PU may be from NMR through OH number. Please provide your suggestions. Thanking you in...
07 October 2017 5,737 1 View
Dear all, If I want to make thermoplastic polyurethanes, what are the critical parameters I have to consider? I want to know, on what this thermoset and/or thermoplastic nature of...
07 October 2017 9,972 5 View
Dear all, Please suggest me, which method is better to measure the hydrophobicity of PU coatings. Contact angle measurement or water absorption method?
15 July 2017 1,120 2 View
Dear all, I want to calculate the hydroxyl value or OH functionality of PEG from 1H NMR. Is it possible to calculate as end functionality as in the other oligomers..? What will be the degree of...
06 June 2017 4,915 5 View
If the PDI of a polymer is 1 it means all the polymer chains are of same molecular weight. an ideal case. What does it mean if the PDI of the polymer is 2? is it possible?
25 April 2017 6,749 6 View
Dear experts, Generally, heavy mass/hard phase or thicker area of polymer matrix seen darker while soft and/or thin phases were seen lighter in electron microscopy like scanning electron...
24 March 2017 8,958 11 View
Dear all, Thanking you in advance for your valuable time. Cross polarization (CP)/magic angle spinning(MAS) NMR Spectroscopy is strictly for solid samples? or we could analyse semi solids/high...
03 June 2016 4,263 4 View
Suppose, we have cyclohexane or benzene or triazine or ferrocene attached polybutadiene based polyurethanes. Which one is expected to have stronger electrostatic interactions with polybutadiene...
11 March 2016 8,896 3 View
I want to calculate the ion exchange capacity of theoretically for polybezimidazolium polymer structure. Is there any equation has to use please specify. Thanking you in advance for your valuable...
09 February 2016 7,889 3 View
Hi, Thanking you in advance for your time. I have substituted phenyl, triazine and ferrocene moieties on to the back bone of polybutadiene expecting to create electrostatic interactions. How can...
18 October 2015 2,487 1 View
