Development of Rigid Polyurethane Foams Based on Kraft Lignin Polyol Obtained by Oxyalkylation Using Propylene Carbonate
, Nuno V. Gama 1, Ana Barros-Timmons 1,*, Dmitry V. Evtuguin 1 and Paula C. O. R. Pinto 2Round 1
Reviewer 1 Report
This manuscript reported the development of rigid polyurethane foams from biomass to support the sustainability of the RPUF industry with an explicit study on the effects of variables involved in order to improve the quality of RPUF for thermal insulation applications. Experiments were designed well and results were delivered in a scientific manner. I suggest it be published after minor revision.
1. In the abstract section, the full name of NCO should be given as other abbreviations.
2. The format of the manuscript should be adjusted in at least two ways according to the template:
1) Remove the blank space on the right side throughout the manuscript.
2) Reference needs to be accommodated in a more confined manner by changing the line space.
Author Response
Dear Reviewer,
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This manuscript is well described, but some issues need t obe addressed by the authors:
1. What is the hydroxyl content of the lignin used?
2. 2. The role of oxyalkylation needs to be explained in some details. Why ti was used in the first place when lignin has large number of hydroxyl groups?
3. Water was used as the blowing agent. But, authors most often stated the effect of the ‘type of blowing agent ’ or nature of the blowing agent?
4. Novelty aspect of this work needs to be stated.
Author Response
Dear reviewer,
Please see the attachment.
Author Response File: Author Response.pdf
