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Luminescent Solar Concentrators Based on Renewable Polyester Matrices
摘要： This study reports for the first time the use of bio-based alternatives for PMMA as host matrix for luminescent solar concentrators (LSCs). Notably, two types of renewable polyesters were synthesized in varying molar ratios via a two-step melt-polycondensation reaction with dibutyl tin oxide as catalyst. The first is a homopolymer of diethyl 2,3:4,5-di-O-methylene galactarate (GxMe) and isosorbide (IGPn), and the second is a random copolymer of GxMe with 1,3-propanediol and dimethyl terephthalate (GTPn). The two polyesters were found to be optically transparent, totally amorphous with a Tg higher than 45 8C and temperature resistance comparable to PMMA. Lumogen Red (LR) and an aggregation-induced emission (AIE) fluorophore, TPETPAFN, were utilized as fluorophores and the derived thin polymer films (25 mm) were found highly homogeneous, especially for those prepared from GTPn, possibly due to the presence of compatibilizing terephthalate units in the matrix composition and the higher molecular weight. The spectroscopic characterization and the optical efficiency determination (hopt) evidenced LSCs performances similar or superior to those collected from LR/PMMA thin films. Noteworthy, hopt of 7.7 % and 7.1 % were recorded for the GTPn-based matrix containing LR and TPETPAFN, respectively, thus definitely supporting the bio-based polyesters as renewable and highly high-performance LSCs.
关键词： luminescent solar concentrators,renewable host matrices,aggregation-induced emission,fluorophores,polyesters
更新于2025-09-23 15:19:57
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Toughness enhancers for bone scaffold materials based on biocompatible photopolymers
摘要： Providing access to the benefits of additive manufacturing technologies in tissue engineering, vinyl esters recently came into view as appropriate replacements for (meth)acrylates as precursors for photopolymers. Their low cytotoxicity and good biocompatibility as well as favorable degradation behavior are their main assets. Suffering from rather poor mechanical properties, particularly in terms of toughness, several improvements have been made over the last years. Especially, thiol–ene chemistry has been investigated to overcome those shortcomings. In this study, we focused on additional means to further improve the toughness of an already established biocompatible vinyl ester-thiol formulation, eligible for digital light processing-based stereolithography. All molecules were based on poly(ε-caprolactone) as building block and the formulations were tested regarding their reactivity and the resulting mechanical properties. They all performed well as toughness enhancer, ultimately doubling the impact resistance of the reference system.
关键词： rheology,polyesters,photopolymerization,biomaterials,monomers,FT-IR
更新于2025-09-10 09:29:36