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首页> 外文期刊>Journal of Applied Polymer Science >Roles of the molecular weight of n-ethylene glycol diacrylates and UV irradiance on the mechanical properties at the gel point of acrylic acid based hydrogels
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Roles of the molecular weight of n-ethylene glycol diacrylates and UV irradiance on the mechanical properties at the gel point of acrylic acid based hydrogels

机译：N-乙二醇二丙烯酸酯分子量的作用和UV辐照对丙烯酸水凝胶凝胶点的机械性能

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We investigated sol-gel transitions in acrylic acid based hydrogels with real time in situ photocrosslinking and Fourier transform mechanical spectroscopy. Crosslinkable n-ethylene glycol diacrylate (EGDA) compounds with molecular weights (MWs) in the range 171-575 g/mol were used in standard solutions of known polyacrylamide. The mutation number (N-mu) was monitored in all of the experiments, such that N-mu was 0.3 or lower at all of the experimental frequencies. During gelation, a frequency independence of tan delta was observed in all cases, such that the storage and loss moduli were scaled as about omega(n); this indicated the establishment of a sample spanning network in the hydrogels with the Winter-Chambon criteria. The relaxation exponents (ns) ranged from 0.35 to 0.81 when they were affected by both the MWs of the EGDAs and the UV irradiance. The stiffness of the critical gels steadily increased with increases in both the MWs of the EGDAs and the UV irradiance. The fractal dimensions decreased at the gel point with increasing MWs of the EGDAs, whereas it increased with an increase in the UV irradiance. An optimization tool (Design-Expert) was used to compare the effects and interactions of the reaction parameters on the gel-time characteristics of the critical gels and those of the fully formed hydrogels. A map (description) of the reaction parameters that can be used in the design of specific networks, particularly with values of n that are close to or equal to 0.5, is proposed. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47606.
机译：我们在丙烯酸基水凝胶中研究了溶胶 - 凝胶过渡，实时原位光源和傅里叶变换机械光谱。在171-575g / mol的标准溶液中使用具有分子量（Mws）的可交联的N-乙二醇二丙烯酸酯（EGDA）化合物在已知的聚丙烯酰胺的标准溶液中。在所有实验中监测突变数（N-MU），使得在所有实验频率的所有实验频率下N-MU为0.3或更低。在凝胶化期间，在所有情况下观察到TAN DELTA的频率独立性，使得储存和损失模量被缩放为约ω（n）;这表明，在水凝胶中建立了跨越冬季Chambon标准的样本网络。当受EGDAS和UV辐照度的MW的影响时，放松指数（NS）的范围为0.35至0.81。临界凝胶的刚度随着EGDA的MW和紫外辐照度的增加而稳步增加。随着EGDA的MWS的增加，凝胶点在凝胶点下减少了分形尺寸，而随着UV辐照度的增加，它增加了。优化工具（设计专家）用于比较反应参数对临界凝胶的凝胶时间特性的影响和相互作用和完全形成的水凝胶的凝胶时间特征。提出了一种可以用于特定网络的设计的反应参数的地图（描述），特别是具有接近或等于0.5的N值。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47606。

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