新型紫外线吸收剂的合成及其在聚乳酸超细纤维膜中的应用

Synthesis of a Novel UV Absorbent and Its Application in Polylactic Acid Superfine Fibrous Membranes

以D-甘露糖和2,4-二羟基二苯甲酮(UV-O)为原料,合成了新型的紫外线吸收剂(3-羟基-4-苯甲酰基)苯基-2,3;4,6-二-O-亚环己基-D-β-吡喃甘露糖苷(UV-O-DHM),其完全分解温度可达372.6℃,具有很好的热稳定性。将UV-O-DHM均匀地掺入聚乳酸(PLA)的二氯甲烷溶液中,通过静电纺丝制得了可生物降解的抗紫外线PLA超细纤维膜。采用扫描电子显微镜观察了纤维形貌,纤维的粗细均匀,直径为3～4μm,且纤维表面有均匀的纳米孔结构。随着PLA纤维中UV-O-DHM浓度的增大超细纤维的紫外辐射透过率降低。当UV-O-DHM的掺入量为1.1%时,在230～350 nm范围内,透过率基本接近于0,同时在365～380 nm的紫外光范围内抗紫外辐射效果明显优于同等条件下的UV-O/聚乳酸纤维。

A novel UV absorbent, （ 3-hydroxy-4-benzoyl ） phenyl 2, 3 ; 4, 6-di-O-cyclohexylidene-D-β- mannopyranoside （ UV-O-DHM）, was synthesized using 2,4-dihydroxy-benzophenone （UV-O） and D-mannose as raw materials. The compound exhibited high decomposition temperature （ Td ） at 372. 6 ℃ and possessed good thermal stability. The biodegradable anti-UV polylaetic acid （PLA） superfine fibrous membranes were prepared via electro-spinning through mixing UV-O-DHM into dichloromethane solution of PLA, and the features of the fiber were clearly characterized by scanning electron microscope. The fiber has uniform diameter of 3 - 4 μm and is evenly covered by the nano-porous. The UV-O-DHM/PLA superfine fiber has good ultraviolet absorption performance. With increasing concentration of UV-O-DHM, UV transmittance （ T% ） decreased, and when the mass fraction of UV-O-DHM was 1.1% , T% was almost 0 in 230 - 350 nm, and the UV protection level was better than that of UV-O/PLA superfine fiber in 365 - 380 nm.