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Enzymatic plasticising of lignin and styrene with adipic acid to synthesize a biopolymer with high antioxidant and thermostability
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2020-01-22 , DOI: 10.1016/j.polymdegradstab.2020.109081
Kumari Vibha , Sangeeta Negi

Green synthesis of biopolymeric material based on renewable resources and can replace the present conventional plastic materials are today's urgent need. For that lignin was first depolymerised into its macromonomeric units using laccase. And through lipase mediated trans-esterification reaction, monolignol/oligolignols are plasticized with adipic acid at one end and further at another end of adipic acid, styrene molecules was plasticized by atomic transfer radical polymerization (ATRP). FTIR spectroscopy shows a disappearance of hydroxyl band (3437.75 cm−1) and appearance of ether band (1300-1000 cm−1) in the biopolymeric product which revealed that the polymerization occurs due to the formation of ether bonds in between the [-lignin-adipic acid-styrene-] monomeric units. Thermogravimatric analysis (TGA) and Dynamic mechanical analysis (DMA) shows that the polymeric film synthesised is highly thermostable with a glass transition temperature (Tg) of 99.7 °C. On XRD analysis it was observed that the degree of crystallinity increases on adding adipic acid moiety into the polymer and was calculated about 21.88% using DSC. SEM analysis shows lignin was properly dispersed within the styrene resulting into the homogeneous surface. Average molecular weight of the lignin–styrene based polymer was obtained 748063.2 g/mol using GPC and elemental analysis. Biological characterization of the polymeric film has shown strong antioxidant activity with least cytotoxicity on peripheral blood mononuclear cells (PBMCs) which enhanced its biocompatibility. The polymer synthesised can be a potential candidate for renewable and sustainable polymeric material and biomaterial.



中文翻译:

木质素和苯乙烯与己二酸的酶促增塑,以合成具有高抗氧化剂和热稳定性的生物聚合物

当今迫切需要基于可再生资源的绿色合成生物聚合材料,并且可以替代目前的常规塑料材料。为此,首先使用漆酶将木质素解聚成其大分子单体单元。通过脂肪酶介导的酯交换反应,单己醇/低聚木糖醇在己二酸的一端被增塑,而在己二酸的另一端则被原子转移自由基聚合(ATRP)增塑。FTIR光谱显示羟基带消失(3437.75 cm -1)而出现醚带(1300-1000 cm -1)表明该聚合反应是由于在[-木质素-己二酸-苯乙烯-]单体单元之间形成醚键而发生聚合。热重分析(TGA)和动态力学分析(DMA)表明,合成的聚合物薄膜具有99.7°C的玻璃化转变温度(Tg),具有很高的热稳定性。在XRD分析中,观察到在向聚合物中添加己二酸部分时结晶度增加,并且使用DSC计算为约21.88%。SEM分析显示木质素适当地分散在苯乙烯中,从而形成均匀的表面。使用GPC和元素分析,得出木质素-苯乙烯基聚合物的平均分子量为748063.2 g / mol。聚合物膜的生物学特性显示出对外周血单核细胞(PBMC)具有强的抗氧化活性和最小的细胞毒性,从而增强了其生物相容性。合成的聚合物可能是可再生和可持续的聚合材料和生物材料的潜在候选者。

更新日期:2020-01-22
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