复合增塑剂对增塑聚乙烯醇增塑效果及流变性能的影响,ChemistrySelect

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复合增塑剂对增塑聚乙烯醇增塑效果及流变性能的影响
ChemistrySelect ( IF 1.9 ) Pub Date : 2024-04-09 , DOI: 10.1002/slct.202304820
Chao Wang ₁ , Liming Zou ₁ , Huajun Wang ₁ , Yanli Wang ₁ , Yan Vivian Li ₂

Affiliation

以D-甘露醇(DM)和1-丁基-3-甲基溴化咪唑(BMIMBr)为复合增塑剂(DB)对聚乙烯醇(PVA)进行改性，制备PVA/DB复合材料。通过傅里叶变换红外光谱（FT-IR）、差示扫描量热法（DSC）、热重分析（TGA）和熔体流动指数仪（MI）研究了DB对PVA的增塑作用。 FT-IR 分析表明 Br-BMIMBr 和 DM 的 OH 可以与 PVA 的 OH 形成氢键。随着DB的增加，熔体温度(时间平方米）和结晶温度（时间c1PVA/DB复合材料的 ) 降低，初始热分解温度 (时间d), 热处理窗口 (Δ时间) 和 MI 值分别增加。在此基础上，利用毛细管流变仪研究了DB含量对PVA/DB复合材料流变性能的影响。结果表明，PVA/DB复合材料的表观粘度随着DB含量、剪切速率和测量温度的增加而降低。随着测量温度和DB的增加，非牛顿指数（n）增加，结构粘度指数（Δη）减少。粘性流活化能 (Eη)随着剪切速率和DB含量的增加而降低。当测量温度、DB含量和剪切速率在时间平方米+30 -时间平方米+35 °C，40–50 wt% 和 764.8–1504.9 s−1分别表明PVA/DB复合材料的可纺性最优，为今后熔体纺丝工艺的探索奠定理论基础。

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Influence of Complex Plasticizer on Plasticizing Effects and Rheological Properties of Plasticized Poly(Vinyl Alcohol)

Poly(vinyl alcohol) (PVA) was modified using D‐mannitol (DM) and 1‐butyl‐3‐methylimidazole bromide (BMIMBr) as the complex plasticizer (DB), and PVA/DB composite was prepared. The plasticizing effect of DB on PVA was studied by Fourier transform infrared spectroscopy (FT‐IR), differntial scanning calorimetry (DSC), thermos gravimetric analysis (TGA) and melt flow indexer (MI). FT‐IR analysis indicated that Br− of BMIMBr and OH of DM could form H‐bonds with OH of PVA. With the increase of DB, the melt temperature (Tm2) and crystallization temperature (Tc1) of PVA/DB composite decreased, the initial thermal decomposition temperatures (Td), thermal processing window (ΔT) and MI values increased respectively. Based on above studies, the influence of DB content on rheological properties of PVA/DB composite was investigated by the capillary rheometer. The result displayed that apparent viscosity of PVA/DB composite decreased with increasing DB content, shear rate and measured temperature. The non‐Newtonian index (n) increased and structural viscosity index (Δη) decreased with the increase of measured temperature and DB. The viscous flow activation energy (Eη) decreased as the shear rate and DB content increased. When the measured temperature, DB content and shear rate were in the range of Tm2+30 −Tm2+35 °C, 40–50 wt% and 764.8–1504.9 s−1, respectively, the spinnability of PVA/DB composite was optimal, which will lay a theoretical foundation for the exploration of melt spinning process in the future.

更新日期：2024-04-09

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