Effect of the Propionylation Method on the Deformability under Thermal Pressure of Block-Shaped Wood
Round 1
Reviewer 1 Report
The author produced multiple propio-11 nylated wood specimens by several propionylation methods and elucidated the factors affecting 12 the deformability of the wood. The manuscript was well written and organized.
one question is:
How much percent of water for each specimen was? How did this influnence the mechnical properties?
Author Response
Dear Reviewer,
Thank you for your appreciation.
The author produced multiple propionylated wood specimens by several propionylation methods and elucidated the factors affecting the deformability of the wood. The manuscript was well written and organized.
Ans. Thank you for your positive comments.
one question is:
How much percent of water for each specimen was? How did this influnence the mechnical properties?
Ans. These specimens were dried under vacuum before measurements, so their moisture content was almost 0%. We think that this low moisture content of propionylation samples scarcely affected the hot compression test. We also think that effects of moisture content on mechanical properties are important issues to be examined in the future.
Reviewer 2 Report
-
The paper entitled ‘Effect of the propionylation method on the deformability under thermal pressure of block-shaped wood’ is focused on deformability of propionylated cellulose. The paper is well organized and written. Obtained by Authors results are well presented and described.
Below you can find some comments:
- Please add to the paper the new table with samples' symbols and description.
- Symbols T, R and L presented in Table 1 should be explained.
- Did you check the chemical stability of obtained materials in different organic solvents??
Author Response
Dear Reviewer,
Thank you for your appreciation. We revised our manuscript according to your helpful comments.
The paper entitled ‘Effect of the propionylation method on the deformability under thermal pressure of block-shaped wood’ is focused on deformability of propionylated cellulose. The paper is well organized and written. Obtained by Authors results are well presented and described.
Ans. Thank you for your positive comments.
Please add to the paper the new table with samples' symbols and description.
Ans. We added a following table in the Introduction section to explain the samples’ symbols and description.
Table 1. Sample code of the synthesized woods and description of the propionylation methods.
|
Sample Codes |
Propionylation methodsa |
||
|
Regents |
Temp. (°C) |
Time (h) |
|
|
DGR-W |
-b |
-b |
-b |
|
PA-W |
Propionic anhydride |
100 |
24 |
|
TFAA-W |
Trifluoroacetic anhydride/Propionic acid |
60 |
4 |
|
DMAP-W_1 |
4-Dimethylaminopyridine/Propionic anhydride/N-methyl pyroridone |
40 |
24 |
|
DMAP-W_2 |
100 |
24 |
|
|
SA-W_1 |
Sulfuric acid/Propionic acid/Propionyl anhydride/Sodium hydrogen sulfate |
20 |
24 |
|
SA-W_2 |
20 |
48 |
|
|
SA-W_3 |
20 |
72 |
|
|
SA-W_4 |
40 |
24 |
|
a The increase was calculated based on the dry degreased wood pieces before propionylation treatment.; b Without propionylation (Degreased wood).
Symbols T, R and L presented in Table 1 should be explained.
Ans. Description of these symbols were added to the Table. The revised Table is as follows.
Table 2. Increase in the weight and length of each side of the propionylated wood samples relative to the degreased wood piece.
|
Samples |
Increase (%)a |
|||
|
Weight |
Tb |
Rc |
Ld |
|
|
PA-W |
2.1 ± 0.1 |
0.1 ± 0.1 |
0.2 ± 0.0 |
0.2 ± 0.2 |
|
TFAA-W |
58.7 ± 0.2 |
9.4 ± 0.3 |
0.8 ± 0.3 |
−10.4 ± 0.2 |
|
DMAP-W_1 |
40.0 ± 0.1 |
5.9 ± 0.1 |
1.5 ± 0.2 |
0.8 ± 0.2 |
|
DMAP-W_2 |
45.6 ± 0.1 |
5.8 ± 0.1 |
1.5 ± 0.3 |
0 ± 0.2 |
|
SA-W_1 |
2.4 ± 0.1 |
−3.1 ± 0.1 |
−1.9 ± 0.2 |
0.5 ± 0.1 |
|
SA-W_2 |
10.9 ± 0.1 |
−5.9 ± 0.2 |
−5.5 ± 0.3 |
0.3 ± 0.1 |
|
SA-W_3 |
12.2 ± 0.3 |
−8.8 ± 0.2 |
−9.3 ± 0.1 |
0.5 ± 0.2 |
|
SA-W_4 |
37.9 ± 0.8 |
−3.7 ± 0.9 |
−7.2 ± 0.6 |
−3.4 ± 1.1 |
a The increase was calculated based on the dry degreased wood pieces before propionylation treatment. The standard error was calculated based on the values of three samples.; b Tangential direction; c Radial direction; d Longitudinal direction.
Did you check the chemical stability of obtained materials in different organic solvents??
Ans. In this paper, the organic solvent resistance of the propionylated wood have not been investigated. This will be one of the future issues. Thank you for your valuable advice.
