VAc-BA-NMA三元共聚物乳液的流变性能

用旋转粘度计测定了醋酸乙烯酸（VAc）－丙烯酸丁酯（BA）－N－羟甲基丙烯酰胺（NMA）三元共聚物乳液的流变性能，研究了功能性单体NMA和原料配比对液体系流变性能的影响。对流变性能数据进行了线性回归分析，结果表明：VAc－BA－NMA三元共聚物乳液为假塑性流；随NMA含量的增加，乳液粘度增加，流动指数n减小；原料配比中VAc含量的增加，使得乳液体系的流变行为有向牛顿流体方向移动的趋势。     

聚酯型可降解水性聚氨酯的合成及表征

以聚己二酸乙二醇-1,4-丁二醇酯二醇（PBA ）为软段,以二羟基丙酸（DM PA ）为亲水扩链剂,合成水性聚氨酯（WPU ）预聚体,通过三元共聚硅油（S ）接枝改性制备了系列WPU 乳液。采用红外光谱（FT-IR）、水接触角、水降解性、耐水实验等对WPU 结构和性能进行表征。结果表明,聚氨酯胶膜的耐水性和水接触角随着S含量的增大而提高;胶膜水降解速率随着DM PA 含量的增加而提高。应用到羊绒织物上,使得羊绒织物的抗起毛起球性能得到改善。     

Synthesis and Characterization of Styrene-Maleic Anhydride-Butyl Acrylate Terpolymer

A novel surface modifying agent and internal compatilizer of inorganic and macromolecule composite materials,P(St/MAH/BA)terpolymer,was synthesized in butanone by solution polymerization method using styrene(St),maleic anhydride(MAH),and butyl acrylate(BA)as monomers and azobisisobutyronitrile(AIBN)as an initiator.Some affecting factors on terpolymers yields such as polymerization time,reaction temperature,solvent volume,initiator content,and reactants ratios were studied.Furthermore,the structure and thermal properties of terpolymers were primarily characterized and determined by Fourier Transform Infrared Spectroscopy(FTIR),nuclear magnetic resonance(NMR),thermogravimetric analysis(TGA),and gel permeation chromatography(GPC).The results indicate that the terpolymers are random polymers and the yields are low,but the thermal decomposed temperature of terpolymers P(St/MAH/BA)is around 220 ℃ and the average molecular weights(Mw)achieve 1.189×105 g·mol-1.     

流体平移式电卡制冷系统模拟及性能分析

为了改善电卡制冷的性能，以三元聚偏氟乙烯（PVDF）为电卡材料，构建了流体平移主动式电卡蓄冷器（AER），并基于COMSOL Multiphysics多物理场仿真平台建立了该AER系统的二维模型，进行性能仿真。通过特定工况及变参数分析，讨论了电卡制冷的影响因素，发现材料导热性能是制约电卡效应发挥的重要因素，导热性能不佳不但导致施加电场时材料热量无法有效传递给流体，而且会发生温度交叉，导致去电场时未有效降温的材料中心与流体抢夺电卡效应冷量的现象。