Siegu William Mawuko Kodzo,Djouonkep Lesly Dasilva Wandji,Selabi Naomie Beolle Songwe,Bonku Emmanuel Mintah,Cheng Zhengzai,Gauthier Mario
The rising cost of petrochemicals owing to the rapid depletion of fossil resources has gradually divert research interest to novel chemicals derived from biomass feedstock. In this study we explored the synthesis, properties and ecotoxicity of a series of sustainable poly(hexylene 2,5-thiophenedicarboxylate- co -bis(2-hydroxyethoxybenzene)s (PTBHs) copolyesters suitable as form-fil-seal packaging materials. From the results, simply varying the ratios of HDO/BHEB afford control over the copolymers crystallinity, thermal and mechanical properties including degradability. The thermal analysis revealed the copolyesters possess satisfactory glass transition temperature (T g ) ranging from 75 to 112 °C and melting point from 160 to 205 °C, which are comparable to poly(ethylene furanoate) PEF and superior to poly(ethylene terephthalate) PET. These novel biopolymers exhibit tensile strength between 53 and 72 MPa and elongation at break of over 780%, higher than their corresponding homopolyesters. These promising properties were optimized with the increase of TH content, ranging from TB-enriched to TH-enriched copolyesters, exhibiting satisfactory heat-seal strength in the range of 0.77–0.45 N/mm. The biopolymers exhibit the potential as mere replacements to PETs, but their cost-rentability still needs to be investigated. Graphical Abstract The authors synthesized a novel class of fully non-toxic thiophene biopolymers and showed the synergistic effect of HDO on the structure, thermal and mechanical properties.
The utilization of biomass resources in the production of bio-based or bio-recycled polyurethanes (PUs) enhances the sustainable development and eco-friendliness of PU. Herein, a series of new bio-based aliphatic poly(propylene dicarboxylate) diols were synthesized using bio-based 1,3-propanediol (bio-PDO) and aliphatic dicarboxylic acids with different chain lengths. These bio-based polyester diols and 1,4-butanediol (BDO) reacted with 4,4′-dicyclohexylmethane diisocyanate to produce aliphatic PU elastomers (PUEs). The study aimed to evaluate the impact of the structure of poly(propylene dicarboxylate) diols on the architecture, morphology, mechanical properties, and degradation of PUEs, thereby expanding the application of bio-PDO. The results indicate a strong correlation between the degree of microphase separation, tensile properties, and degradation behavior of the synthesized PUEs and the number of methylene groups in the repeating unit of the poly(propylene dicarboxylate) diols. Notably, the PUE derived from poly(propylene pimelate) diol demonstrates the highest level of microphase separation and superior elasticity properties because of the high flexibility of the polyester. On the other hand, PUE prepared from poly(propylene succinate) diol exhibits the fastest degradation performance due to its high density of ester groups. Bio-PDO based polyester diols show significant potential as raw materials for PUEs with biodegradable and adjustable mechanical properties. Highlights Poly(propylene dicarboxylate) diols were prepared from bio-based 1,3-propanediol. The poly(propylene dicarboxylate) diols based polyurethane elastomers (PUEs) have high tensile strength (>22 MPa) and elongation at break (>920%). The morphology, mechanical properties and degradation of PUEs are highly related to the structure of the poly(propylene dicarboxylate) diols. The increasing repeating unit length of the poly(propylene dicarboxylate) diols increases elastic recovery of PUEs.
危险品化学品经营许可证（带存储）