Carbon Fiber-Reinforced Polyamide 6 Composites Formed by In Situ Polymerization—Experimental and Numerical Analysis of the Influence of Polymerization Temperature
Round 1
Reviewer 1 Report
This article is devoted to a comprehensive study of the process of VARTM of some CFRP parts using PA6 and mechanical testing of finished samples. The article uses both computer simulation methods and full-scale experiments, including Raman spectroscopy, scanning force microscopy, tensile and bending tests, as well as impact. The article is written quite clearly. The methods of numerical and experimental studies are described in detail. The introduction gives an adequate overview of the current state of the issue.
The main remark is of a technical nature, namely that some of the figures have a low resolution, which makes it difficult to understand the data presented (In particular, Figures 2, 5, 6, 11, 12).
The sentence on line 239 is not entirely clear. Before and after it was said that the sample made at a temperature of 200 has the best impact strength, but the sentence itself says that it is much worse than samples made at other temperatures.
It is also not entirely clear from the text and Figure 12b why exactly 20 seconds and 40 bar are optimal. Besides, doesn't the data presented in Figure 12b also depend on temperature?
In this connection, the conclusion (lines 316-317) that 20 seconds is the optimal time for the molding process, regardless of the size and shape of the part, is not entirely clear. Can't “dry spots” form during the process of infusion of complex-shaped parts?
Author Response
This paper has been reconstructed as the reviewers’ suggestion. We, the authors, really appreciate the reviewers’ helpful comments. We feel that this paper has become more rigorous and well-constructed after implementing the suggested parts in the manuscript. The revisions to the manuscript were marked up using the “Track Changes” function and shown with red color.
Author Response File: 
Author Response.doc
Reviewer 2 Report
The paper seeks to introduce an approach “Carbon Fiber Reinforced Polyamide 6 Composites Formed by in Situ Polymerization-Experimental and Numerical Analysis of the Influence of Polymerization Temperature”. However, the authors should consider improving upon the quality to further highlight and emphasis.
1. Based on the understanding of what should be included in the abstract. Consider introducing one or two lines highlighting the problem you are trying to solve at the beginning of the abstract.
2. Again, adding one or two lines also highlights the significance of the study at the end of the abstract.
3. Based on the understanding of what should constitute KEYWORDS, a maximum of three words is allowed so reduce it or perhaps abbreviate it.
4. The variable and its corresponding unit should be separated by a space. Check and correct all.
5. The introduction needs to be improved by relating to the mechanics of
the studied materials and their mechanical characteristics. Thereferences to be included are: 10.1007/s10853-022-06994-3, 10.1177/0021998318790093 and 10.1002/app.46770.
6. Figures 2 and 5 are very blur.
7. In section 2.4, could you also indicate in addition to the accelerating voltage the working range applied and the scale bar used.
8. In section 4.1 you mentioned and I quote “the frozen mixture samples were heated to 80 °C, and then from 80 °C to 180 °C at a heating rate of 5 °C/min”. was there a break intermittently between these heating temperatures and why?
9. Was figure 6 inserted as a screenshot. Re-insert the text to make it more visible.
10. One standard of spelling should be adopted. For instance, if you have used both “figure” and its abbreviation “fig.”. consider adopting one style.
Author Response
This paper has been reconstructed as the reviewers’ suggestion. We, the authors, really appreciate the reviewers’ helpful comments. We feel that this paper has become more rigorous and well-constructed after implementing the suggested parts in the manuscript. The revisions to the manuscript were marked up using the “Track Changes” function and shown with red color.
Author Response File: Author Response.doc
