The Impact of PP-g-MAH on Mechanical Properties of Injection Molding of Long Glass Fiber/Polypropylene Pellets from Thermoplastic Pultrusion Process
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThe manuscript of Jmmp-2871204 investigated the impact of PP-g-MAH on the pultrusion process of long glass fiber reinforced thermoplastic (LFTP) pellets. Mechanical and physical properties of LFTP were examined by incorporating PP-g-MAH at concentrations of 4, 8, and 12 wt% through injection molding, revealing that an optimal concentration was found at 4wt%. The research methods and approach are reasonable. Howerver， The title of the manuscript，i.e. “An alternative method for producing long fiber thermoplastic plastic pellets through the thermoplastic pultrusion process” suggests that there is a need for further modification.
[1] Please provide a comprehensive application overview of LFTP pellets, specifically for injection molding, extrusion, thermoforming, or other processing techniques. It is crucial to consider the distinct material properties required for each processing method.
[2] Please provide a comprehensive explanation of the mechanism of action of PP-g-MAH based on the experimental findings obtained from SEM and FTIR spectra.
[3] The injection molding process is known to cause damage to the length of the glass fiber due to screw action, resulting in potential variations in the final fiber length of molded specimens. Could you please provide specific details regarding the location of the SEM results?
[4] Please describe the specific advantages of this method in the field of material processing compared to existing results and conventional methods, such as improving production efficiency and reducing production costs.
Comments on the Quality of English Languagenone
Author Response
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Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThe publication concerns current technological problems related to the processing and production of composites reinforced with long glass fibers, but can be freely used to produce other composite materials using other matrix and fillers. I present my comments below:
line 43 - Due to the lack of a crystallization process, amorphous materials with a low glass transition temperature are not modified with fillers. Only PC or blends PC/ABS are modify of fillers because of high glass transition temperature.
line 120 - drying time of PP given imprecisely - "overnight drying"
line 120 - why did you dry PP - it is not higroscopic material
the drying temperature was to high. Normaly it should be 80*C/2-3 h
line 126 - wrond numeration of chapters 2.2 methods .... and next 2.2 Characterization and measurement
line 151 - the figure 1 should be in 2.2 paragraph were the method of sample preparation were described
line 151 - the diagram does not indicate when the PP-g-MAH modifier was added
line 151 - Please describe more information about proces of LFTP production
Did you used different steps of injection moulding temperature 160-230*C?
How the LFPT composite granulate was cooling after forming in die?
How fast pulling unit move during the process?
How and when the LFTP was cutted?
Please pressent the injection moulding parameters which are important for the proces mouldings properties as: mould temperature, injection speed, holding pressure.
line 156 - Did you used extensometer for tensile modulus determination?
line 289 - figure 8 was not pressent e) picture like on the Fig. 7.
Most of conducted tests are conected with influence of PP-g-MAH on mechanical procerties of LFTP composites so I suggests to point it in the title of publication.
Poorly described tool and technology of pultrusion that is the basis of the publication - at least that's what the title suggests.
Author Response
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Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Comments and Suggestions for AuthorsAfter incorporating the suggested revisions, the manuscript demonstrates a reasonable content and structure. I recommend accepting it for publication. However, there are some minor revisions that still need to be addressed.
(1) Fig.3， Fig.5, Fig.7. Please give the label of each picture.
(2) Line 264-274 3.2. Fiber length of LFTPc. Please give the statistical method of the percentage of fiber length.
(3) Line 370. 4. Conclusions. Some of the content is repeated in the previous discussion, please refine and simplify and rewrite.
Author Response
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