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

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3~4 μm，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。

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

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 polylactic 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.