School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Mae Hia, Muang, Chiang Mai, Thailand.
Cluster of Agro Bio-Circular-Green Industry, Faculty of Agro-Industry, Chiang Mai University, Mae Hia, Muang, Chiang Mai, Thailand.
Sci Rep. 2021 Sep 28;11(1):19250. doi: 10.1038/s41598-021-98807-x.
A mixture of corn starch and glycerol plasticizer (CSG) was blended with latex natural rubber (LNR) and carboxymethyl cellulose (CMC). The addition of 10 phr of CMC improved the Young's modulus (6.7 MPa), tensile strength (8 MPa), and elongation at break (80%) of the CSG/LNR blend. The morphology of the CSG/LNR/CMC blends showed a uniform distribution of LNR particles (1-3 µm) in the CSG matrix. The addition of CMC enhanced the swelling ability and water droplet contact angle of the blends owing to the swelling properties, interfacial crosslinking, and amphiphilic structure of CMC. Fourier transform infrared spectroscopy confirmed the reaction between the C=C bond of LNR and the carboxyl groups (-COO) of CMC, in which the Na ions in CMC acted as a catalyst. Notably, the mechanical properties of the CSG/LNR/CMC blend were improved owing to the miscibility of CSG/CMC and the CMC/LNR interfacial reaction. The CSG/LNR/CMC biodegradable polymer with high mechanical properties and interfacial tension can be used for packaging, agriculture, and medical applications.
将玉米淀粉和甘油增塑剂（CSG）混合物与天然胶乳（LNR）和羧甲基纤维素（CMC）混合。添加 10 phr 的 CMC 可提高 CSG/LNR 共混物的杨氏模量（6.7 MPa）、拉伸强度（8 MPa）和断裂伸长率（80%）。CSG/LNR/CMC 共混物的形态显示出 LNR 颗粒（1-3 µm）在 CSG 基质中的均匀分布。CMC 的加入由于其溶胀性能、界面交联和两性结构，提高了共混物的溶胀能力和水滴接触角。傅里叶变换红外光谱证实了 LNR 的 C=C 键与 CMC 的羧基（-COO）之间的反应，其中 CMC 中的 Na 离子充当催化剂。值得注意的是，由于 CSG/CMC 的混溶性和 CMC/LNR 界面反应，CSG/LNR/CMC 共混物的力学性能得到了提高。具有高力学性能和界面张力的 CSG/LNR/CMC 可生物降解聚合物可用于包装、农业和医疗应用。
