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However, the use of more harsh methods of removing soil from the polymer could cause its damage.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:45
The ML analysis is burdened with an error that may be due to an incomplete removal of soil from the film surface.	Bruce 2024-12-1	028	Bruce 2024-12-1 07:45
Before the mass of each the sample was determined, the samples were thoroughly washed, dried and stored in a desiccator.	Bruce 2024-12-1	027	Bruce 2024-12-1 07:45
For sample PLA_2 degradation of surface was not visible.	Bruce 2024-12-1	018	Bruce 2024-12-1 07:45
Surface degradation of polymer was mainly caused by microcracks which indicate the biofragmentation stage of a degradation process.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:45
After 12 months the changes were also noticeable for PLA_1 using SEM technique what confirms mainly surface erosion of the polymer.	Bruce 2024-12-1	021	Bruce 2024-12-1 07:44
In this case, the effects of surface erosion and disintegration of the materials can clearly be seen especially in PBS_1 material.	Bruce 2024-12-1	025	Bruce 2024-12-1 07:44
Changes were observed only after one year.	Bruce 2024-12-1	017	Bruce 2024-12-1 07:44
Natural conditions of the process did not favor quick degradation of the films made of biodegradable materials.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:44
The SEM studies confirm macroscopic observations and lack of changes in morphological structure of the surface of samples after 3 and 6 months of degradation in soil	Bruce 2024-12-1	019	Bruce 2024-12-1 07:44
However, the shapes typical for technological processes of film production were visible as well as, especially for PLA_2, where mineral fillers have been embedded in the polymer matrix.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:43
The samples before degradation were characterized by a relatively smooth texture.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:43
A more in-depth study of morphologic changes was performed by scanning electron microscopy.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:43
Very low rate of degradation of PLA in soil under natural conditions was noticed by Hoshino et al.	Bruce 2024-12-1	026	Bruce 2024-12-1 07:43
During the first 6 months of degradation, the average air temperature was only 3.4 ��C, with the total rainfall of only 180 mm.	Bruce 2024-12-1	033	Bruce 2024-12-1 07:43
The lack of the surface changes in all tested polymers after 3 and 6 months of degradation was mainly due to environmental conditions.	Bruce 2024-12-1	020	Bruce 2024-12-1 07:42
The results obtained for the PBS_1 test after 12 months prove the presence of all steps of degradation.	Bruce 2024-12-1	023	Bruce 2024-12-1 07:42
Additionally, small holes appeared on the surface of the film.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:42
For PBS_1, the color change of the sample was observed only after 12 months of degradation.	Bruce 2024-12-1	019	Bruce 2024-12-1 07:42
According to explanations by Rudnik and Briassoulis (2011), microorganisms that degrade PLA are not easily found in natural environments.	Bruce 2024-12-1	020	Bruce 2024-12-1 07:42

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