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Article
Peer-Review Record

A Self-Healing Coating with UV-Shielding Property

Coatings 2019, 9(7), 421; https://doi.org/10.3390/coatings9070421
by Lei Peng 1,*, Musong Lin 1, Sheng Zhang 2, Li Li 1, Qiang Fu 1 and Junbo Hou 2
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Reviewer 3: Anonymous
Coatings 2019, 9(7), 421; https://doi.org/10.3390/coatings9070421
Submission received: 22 May 2019 / Revised: 20 June 2019 / Accepted: 27 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Self-Healing Coatings and Films)

Round  1

Reviewer 1 Report

In this paper, the authors report the preparation and the characterization of a novel coating with UV-shielding property. The paper is well organized with very interesting results. The conclusions are coherently supported by the reported measurements.

I only suggest to the authors more attention to the recent literature. Indeed, the list of references does not include centrally important and well-known papers in the field. The authors must compare their results with previous studies and report their new insights into this field. It is important to point out the original contribution of the authors.

 

Author Response

Reviewer 1:

In this paper, the authors report the preparation and the characterization of a novel coating with UV-shielding property. The paper is well organized with very interesting results. The conclusions are coherently supported by the reported measurements.

I only suggest to the authors more attention to the recent literature. Indeed, the list of references does not include centrally important and well-known papers in the field. The authors must compare their results with previous studies and report their new insights into this field. It is important to point out the original contribution of the authors.

Response: In the introduction, we have added some previous studies about the self-healing coatings with cyclodextrine and adamantane, and point out the contributions of the authors.


Reviewer 2 Report

“A Self-healing coating with UV-shielding property” is clearly written, but several lacks considerably decrease its scientific value:

1.     It is not the first publication in the field of self-healing acrylic materials with cyclodextrine and adamantane [please, search in Scopus: TITLE-ABS-KEY ( coating  AND  adamantane ) )  AND  ( cyclodextrin ); ie. ca. 18 publications]. Meanwhile, the manuscript does not mention it at all, but explains the main phenomenon as it would have been discovered for the first time. The idea is not new.

2.     There is no information on the technique of application onto surface.

3.     No potential practical applications has been given.

4.     There is no studies on coatings hardness/softness and scratch resistance (ie. resistance to remain undamaged, without utilization of self-healing effect).

In my opinion this article requires a serious revision and conducting additional tests, that should be re-evaluated by reviewers to be acceptable for publication in Coatings.


Author Response

Reviewer 2:

“A Self-healing coating with UV-shielding property” is clearly written, but several lacks considerably decrease its scientific value:

1. It is not the first publication in the field of self-healing acrylic materials with cyclodextrine and adamantane [please, search in Scopus: TITLE-ABS-KEY (coating  AND adamantane ) ) AND ( cyclodextrin ); ie. ca. 18 publications]. Meanwhile, the manuscript does not mention it at all, but explains the main phenomenon as it would have been discovered for the first time. The idea is not new.

Response: In this paper, we use the inclusion of cyclodextrin and adamantane to achieve self-healing effect. Although the viewpoint draws on the ideas of previous researchers (we also quoted them in the introduction), we grafted a UV-shielding substance on the reactants of the coating to achieve self-healing and UV-shielding, which was first proposed.

 

2. There is no information on the technique of application onto surface.

Response: We have added the technique of application onto surface in 3.3 Sample characterization and application. 

 

3. No potential practical applications has been given.

Response: We have added one potential application of the coating in the introduction.

 

4. There is no studies on coatings hardness/softness and scratch resistance (ie. resistance to remain undamaged, without utilization of self-healing effect).

Response: Actually, in 4.2 Mechanical properties and wear resistance of coatings, it showed the scratch resistance of coating that without utilization of self-healing effect. As known, the self-healing substances in the coating are the host group and the guest group. So, we removed the host-guest complex from the self-healing coating, and obtained P(HEMA-co-BA) and TiO2/P(HEMA-co-BA). As shown in Figure 7b, the MLR value of P(HEMA-co-BA) and TiO2/P(HEMA-co-BA) were measured. It showed that the MLR value of P(HEMA-co-BA) and TiO2/P(HEMA-co-BA) are higher than that of self-healing coating, which means the scratch resistance of coating without utilization of self-healing effect is not as good as that of self-healing coating. This is because of two reasons. One is that the organic molecules (β-CD + HEMA-Ad) were modified on the surface of TiO2 nanoparticles to improve their compatibility with polymer networks of self-healing coating. The other reason is that the host and guest groups acts as a cross-linking agent during the polymerization process, which not only improves the stability of the nanoparticles in the polymer network, but also significantly enhances the overall mechanical properties of the coating.

In my opinion this article requires a serious revision and conducting additional tests, that should be re-evaluated by reviewers to be acceptable for publication in Coatings.


Reviewer 3 Report

The manuscript is interesting and can be improved in order to be published.

- Minor corrections on english: raws 40, 146, 214, 216, etc.

- please add in the abstract a paragraph on the coating composition;

- in the Introduction I recommend that the authors detail the self-healing materials already developed in the literature; 

- 4.1.2 should became 4.1.1 in order to keep the same order of the synthesis;

- what part of the coating is responsable for the hydrophobicity property? how is it explained?

- please provide the SEM images of the coating.

Author Response

Reviewer 3:

The manuscript is interesting and can be improved in order to be published.

- Minor corrections on english: raws 40, 146, 214, 216, etc.

Response: We have scrutinized the whole manuscript carefully and corrected the mistakes.

 

- please add in the abstract a paragraph on the coating composition;

Response: We have added the coating composition in the abstract. 

 

- in the Introduction I recommend that the authors detail the self-healing materials already developed in the literature;

Response: We have detailed the self-healing materials in the literature in the introduction.

 

- 4.1.2 should became 4.1.1 in order to keep the same order of the synthesis;

Response: 4.1.2 has been changed to 4.1.1.

 

- what part of the coating is responsable for the hydrophobicity property? how is it explained?

Response: The hydrophobic groups on HEMA and BA are responsible for the hydrophobic properties of the coating, because the chemical formula of HEMA is CH2=CCH3COOCH2CH2OH, and the chemical formula of BA is CH2CHCOOC4H9. After polymerization, a large amount of -CH2- exists in the molecular chain, which plays a hydrophobic role.

 

- please provide the SEM images of the coating.

Response: We have provided the SEM images of the coating before and after self-healing in Figure 13 and SEM image of the coating surface in Figure 8.


Round  2

Reviewer 2 Report

I can accept the explanation of coatings scratch resistance, although it has not been tested according to standardized method. Unfortunately, all the rest of my comments have not been addressed correctly. None of published articles in the field of self-healing acrylic materials with cyclodextrine and adamantane has been cited. Application technique has not been described. Future applications of prepared materials have not been given. Coatings hardness has not been tested. No standardized measurements of the adhesion parameter has been done. In my opinion, this manuscript has too many inaccuracies from the viewpoint of a specialist in the narrow field of coating materials, so it should not be published in Coatings journal.


Author Response

1.We have changed some reference and cited articles in the field of self-healing materials with beta-cyclodextrin and adamantane, shown in [16][17][18].

2.Future applications of this coating have been given in Conclusion, shown as “With both excellent self-healing and UV-shielding properties, this coating can be used on the surface of power cables to prevent mechanical damage and ultraviolet aging, thereby improving the service life of power cables”.

3.The hardness of this coating has been tested according to standard (ASTM D3363 - 05(2011)), shown in 4.3 Adhesion and hardness of coating.

4.Thanks for the suggestion of “standardized measurements of the adhesion”. We will improve the measurements of the adhesion of coatings in our next researches. On the other hand, although no standardized measurements of the adhesion parameter has been done in this paper, we have demonstrated that the coating has excellent adhesion, as shown in Figures 7 and 8. It can be seen that the self-healing coating has the lowest MLR (0.07%), much lower than that of commercial coating (0.12%), which means the adhesion of self-healing coating is far superior to that of commercial coating. Moreover, the self-healing coating remains intact on the substrate, even if the substrate is bent and twisted.


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