López Serna Daniel, Elizondo Martínez Perla, Reyes González Miguel Ángel, Zaldívar Cadena Antonio Alberto, Zaragoza Contreras Erasto Armando, Sánchez Anguiano María Guadalupe
Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N, Cd. Universitaria, 66455 San Nicolás de los Garza, N.L, México.
Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil, Av. Universidad S/N, Cd. Universitaria, 66455 San Nicolás de los Garza, N.L, México.
Polymers (Basel). 2019 Jun 25;11(6):1080. doi: 10.3390/polym11061080.
In recent years, the pursuit of new polymer materials based on renewable raw materials has been intensified with the aim of reusing waste materials in sustainable processes. The synthesis of a lignin, styrene, and butyl acrylate based composite was carried out by a mass polymerization process. A series of four composites were prepared by varying the amount of lignin in 5, 10, 15, and 20 wt.% keeping the content of butyl acrylate constant (14 wt.%). FTIR and SEM revealed that the -OH functional groups of lignin reacted with styrene, which was observed by the incorporation of lignin in the copolymer. Additionally, DSC analysis showed that the increment in lignin loading in the composite had a positive influence on thermal stability. Likewise, Shore D hardness assays exhibited an increase from 25 to 69 when 5 and 20 wt.% lignin was used respectively. In this same sense, the contact angle (water) measurement showed that the LEBA15 and LEBA20 composites presented hydrophobic properties (whit contact angle above 90°) despite having the highest amount of lignin, demonstrating that the interaction of the polymer chains with the -OH groups of lignin was the main mechanism in the composites interaction.
近年来，为了在可持续过程中重新利用废料，人们加大了对基于可再生原料的新型聚合物材料的研发力度。通过本体聚合法合成了一种基于木质素、苯乙烯和丙烯酸丁酯的复合材料。通过将木质素的含量分别设定为5%、10%、15%和20%（重量百分比），同时保持丙烯酸丁酯的含量恒定（14%，重量百分比），制备了一系列四种复合材料。傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分析表明，木质素的-OH官能团与苯乙烯发生了反应，这一点可通过木质素在共聚物中的掺入得到证实。此外，差示扫描量热法（DSC）分析表明，复合材料中木质素含量的增加对热稳定性有积极影响。同样地，邵氏D硬度测试结果显示，当分别使用5%和20%（重量百分比）的木质素时，硬度从25增加到了69。同样，接触角（水）测量结果表明，尽管LEBA15和LEBA20复合材料中的木质素含量最高，但它们仍表现出疏水性（接触角大于90°），这表明聚合物链与木质素的-OH基团之间的相互作用是复合材料相互作用的主要机制。
