研究目的
Investigating the degree of crystallinity and thermal stability of newly developed thermoplastic polyolefin (TPO) encapsulant for crystalline silicon PV modules lamination and comparing it with the most commonly used ethylene vinyl acetate (EVA) copolymer encapsulant.
研究成果
TPO encapsulant has been successfully laminated at 150 °C for 9 min and its thermal behavior and properties have been studied in relation with EVA. TPO shows higher melting point and thermal stability than EVA, with no crosslinking reaction involved. The degree of crystallinity is slightly higher for TPO but nearly the same before and after lamination. TGA results indicate TPO is more thermally stable, making it a potential alternative to EVA encapsulant for PV module applications.
研究不足
The study focuses on the thermal behavior and crystallinity of TPO and EVA encapsulants. The mechanical, optical, and electrical properties affected by crystallinity are mentioned but not deeply analyzed. The study does not cover long-term outdoor performance or degradation mechanisms under real-world conditions.
1：Experimental Design and Method Selection:
The study involves the use of differential scanning calorimeter (DSC) for determining the peak melting point and degree of crystallinity, and thermogravimetric analysis (TGA) for thermal stability and decomposition onset temperature. X-ray diffraction (XRD) is used to study the crystallinity of the encapsulants.
2：Sample Selection and Data Sources:
TPO encapsulant (0.60 mm thickness) and commercially available standard EVA encapsulant film are used. Samples are prepared in glass/encapsulant/glass and Teflon/encapsulant/Teflon structures for transmittance test and thermal properties study, respectively.
3：60 mm thickness) and commercially available standard EVA encapsulant film are used. Samples are prepared in glass/encapsulant/glass and Teflon/encapsulant/Teflon structures for transmittance test and thermal properties study, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: DSC (TA instruments, Q2000), TGA (diamond model, Perkin Elmer, USA), X’ Pert Pro PANalytical for XRD, and automatic industrial laminator (Boost Solar, BSL22360AC-II & III laminator).
4：Experimental Procedures and Operational Workflow:
Lamination is done at 150 °C for both encapsulants. DSC and TGA analyses are performed with a heating rate of 10 °C/min in a stream of dry nitrogen. XRD measurements are taken within the scattering angle range from 2°–88°.
5：8°.
Data Analysis Methods:
5. Data Analysis Methods: The degree of crystallinity is calculated via the total enthalpy method. The degree of crosslinking for EVA is calculated from the specific enthalpies of the crosslinking reaction of uncured and cured EVA.
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