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Thorough examination of the surfaces of PLA_1 and PLA_2 films after 3, 6 and 12 months of degradation in soil, no changes due to erosion were noticed neither in the color of the film nor in its original shape.	Bruce 2024-12-1	021	Bruce 2024-12-1 07:41
The next steps of biodegradation (biofragmentation and assimilation) are characterized by the appearance of small/huge holes on the surface of polymer sample, finally leading to its disintegration.	Bruce 2024-12-1	030	Bruce 2024-12-1 07:41
This discoloration can be caused by microorganisms present on the surface of the sample, which can change the pH of materials leading to color changes and promoting damage on material properties by hydrolytic reaction	Bruce 2024-12-1	022	Bruce 2024-12-1 07:41
The first stage of degradation, called the biodeterioration, is characterized mainly by a change in the color of the sample's surface.	Bruce 2024-12-1	020	Bruce 2024-12-1 07:41
The number of hours with the sun shining during the day (not overcast sky) was closely correlated with the air temperature.	Bruce 2024-12-1	041	Bruce 2024-12-1 07:41
Monthly precipitation above 40 mm occurred mostly when the monthly average air temperature was above 10 ��	Bruce 2024-12-1	026	Bruce 2024-12-1 07:40
The conditions, in which the biodegradation research was conducted, did not differ significantly from the average long-term temperature (7.3 ��C) as well as the magnitude of precipitation (607 mm) in Poland.	Bruce 2024-12-1	023	Bruce 2024-12-1 07:40
The total amount of rainfall during the year was 560 mm.	Bruce 2024-12-1	025	Bruce 2024-12-1 07:40
The range of variation of the instantaneous temperatures ranged from ?20 �� to 35 ��.	Bruce 2024-12-1	026	Bruce 2024-12-1 07:40
During the first 7 months of biodegradation tests, the average monthly air temperature was below 11 ��C, while the average temperature during the 12 months was 9.4 ��C.	Bruce 2024-12-1	021	Bruce 2024-12-1 07:40
Fig. 1a shows the changes of the average air temperature in individual months, while the standard deviations present the minimum and maximum air temperatures in a given month	Bruce 2024-12-1	027	Bruce 2024-12-1 07:40
The properties of field soil, in which the biodegradation process was carried out, were determined at the start of the process.	Bruce 2024-12-1	023	Bruce 2024-12-1 07:39
The measurements for the 10 samples were obtained at 23 �� and 50 % relative humidity.	Bruce 2024-12-1	027	Bruce 2024-12-1 07:39
The test was performed with the initial distance of 50 mm between the clamps and a velocity of 50 mm/min.	Bruce 2024-12-1	023	Bruce 2024-12-1 07:39
The size of the tested samples was determined by the size of the samples taken without defects from the field and was equal to 10 �� 100 mm2.	Bruce 2024-12-1	020	Bruce 2024-12-1 07:39
Tensile properties of the tested film samples, e.g., stress at break and strain at break, were estimated by using an Instron 5944 (Instron, USA) mechanical testing machine.	Bruce 2024-12-1	022	Bruce 2024-12-1 07:39
Thermal decomposition of samples was carried out according to PN-EN-ISO-11358-1.	Bruce 2024-12-1	025	Bruce 2024-12-1 07:39
The sample was heated from 30 to 600 �� with a heating rate equal to 10 ��/min under air atmosphere.	Bruce 2024-12-1	023	Bruce 2024-12-1 07:38
The thermal properties of tested films were carried out using the thermogravimetric analyzer (Netzsch STA 409 PG).	Bruce 2024-12-1	024	Bruce 2024-12-1 07:38
Macroscopic observations of the film surface were carried out using the camera Panasonic DMC-FZ28 whereas microscopic examination of tested films were performed with the scanning electron microscope	Bruce 2024-12-1	027	Bruce 2024-12-1 07:37

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