ODA⁃TA@L⁃CNC的制备及对多功能PLA复合膜的影响  

Preparation of ODA⁃TA@L⁃CNC and its effect on multifunctional PLA composite films

作　　者：孙子佳 雒翠梅 王启航 王旭洁 母军[1] SUN Zijia;LUO Cuimei;WANG Qihang;WANG Xujie;MU Jun(Key Laboratory of Wood Material Science and Application,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]木质材料科学与应用教育部重点实验室,北京林业大学,北京100083

出　　处：《中国塑料》2023年第12期7-15,共9页China Plastics

摘　　要：以竹剩余物为原料制备木质纤维素纳米晶(L-CNC),利用单宁酸(TA)中邻苯二酚基团的化学反应活性,将十八胺(ODA)接枝到L-CNC表面对其改性,采用溶液浇铸法制备聚乳酸(PLA)复合膜,探讨了改性前后不同含量LCNC对PLA复合膜力学性能、抗氧化性能、紫外屏蔽性能及疏水性能的影响。结果表明,ODA通过TA接枝到L-CNC表面可以提高L-CNC与PLA的相容性;当改性物ODA-TA@L-CNC的含量为PLA的1%(质量分数,下同)时,复合膜的断裂伸长率和断裂韧性分别为20.42%和8.55 MJ/m^(3),是纯PLA膜的4倍和11倍,拉伸强度达到46.84 MPa;疏水性能得到显著改善,1 min内接触角稳定达到约100°;当ODA-TA@L-CNC含量为1.5%时,复合膜的DPPH自由基清除率为49.30%,表现出良好的抗氧化性能;在紫外区波长范围内的平均阻隔比为44.81%,可以屏蔽大部分UVB(280~320 nm)光谱。Lignocellulosic nanocrystals(L-CNC)were prepared by using bamboo residue as a raw material and then modified by grafting octadecylamine(ODA)onto their surfaces through utilizing the chemical reactivity of catechol groups in tannic acid(TA).A series of composite films based on modified L-CNC and poly(lactic acid)(PLA)were prepared through solution casting.The effect of L-CNC content on the mechanical,antioxidant,UV shielding,and hydrophobic properties of the composite films were investigated.The results indicated that the grafting modification of ODA improved the compatibility of L-CNC with PLA.When the content of ODA-TA@L-CNC was 1 wt%,The composite films showed elongation at break of 20.42%and fracture toughness of 8.55 MJ/m^(3),which were 3 times and 10 times higher than those of neat PLA film,respectively.Meanwhile,their tensile strength was increased to 46.84 MPa,and their hydrophobic performance was significantly improved with a stable contact angle of about 100°within 1 minute.When the content of ODA-TA@L-CNC was 1.5 wt%,the composite films obtained a free radical scavenging rate of 49.30%for DPPH,indicating a good antioxidant property.They also gained an average blocking ratio of 44.81%in the wavelength range of the ultraviolet region.This means that the composite films can shield most of the UVB spectrum(280~320 nm).

关 键 词：聚乳酸 木质纤维素纳米晶 单宁酸 十八胺 复合膜 

分 类 号：TQ321.5[化学工程—合成树脂塑料工业]