英语翻译3.Results and discussion3.1.Water uptake and diffusion coefficientsGravimetric results are presented in Fig.1 were the frac-tional amount of water is plotted against t1/2.In Fig.2,the water content measured by FT-NIR for the different sam

英语翻译3.Results and discussion3.1.Water uptake and diffusion coefficientsGravimetric results are presented in Fig.1 were the frac-tional amount of water is plotted against t1/2.In Fig.2,the water content measured by FT-NIR for the different sam
英语翻译
3.Results and discussion
3.1.Water uptake and diffusion coefficients
Gravimetric results are presented in Fig.1 were the frac-tional amount of water is plotted against t1/2.In Fig.2,the water content measured by FT-NIR for the different samples is also presented.
From the initial linear portion of the curves,water diffu-sion coefficients can be calculated according to the follow-ing equation:
where wt,w0 and w∞ are the weights of the samples at immersion time t,t=0 and at the saturation equilibrium,e is the thickness of the sample,and D the water diffusion coefficient.In Table 1,D and the equilibrium water content are presented.No great differences are observed in function of curing degree.
3.2.Volume change during water uptake
From FT-NIR spectra at different immersion times it is possible to obtain information on the volume change following water uptake.According to the Lambert–Beer law,absorbance at a certain wavenumber,A,were absorption takes place is proportional to the number of absorbing species perunit section.Therefore,A−3/2 should be proportional to the volume in which the absorbing species are distributed.If we select some wavenumber specific of the IR spectrum of the neat resin,sufficiently far away from absorption of water molecules,we can measure the fractional volume change using the following expression:
were A0 and At are the integrated absorbances of the reference band at 4623 cm−1 at immersion times t=0 and t,ΔV/V0the fractional volume change following water uptake.In Fig.3,the fractional volume change is plotted against immersion time.
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英语翻译3.Results and discussion3.1.Water uptake and diffusion coefficientsGravimetric results are presented in Fig.1 were the frac-tional amount of water is plotted against t1/2.In Fig.2,the water content measured by FT-NIR for the different sam
3 .结果和讨论
3.1 .水的吸收和扩散系数
重量结果图.1是压裂性的水量是阴谋反对t1 / 2为.图.2 ,水分含量测定傅里叶变换近红外的不同样品还介绍.
从最初的线性部分的曲线,水弥散系数可以计算的后续性方程：
其中重,w0和W ∞是重量的样品浸泡时间中t ,t = 0和饱和平衡,电子商务是厚度的样品,和D的水扩散系数.在表1中,D和平衡水含量介绍.没有太大的差异观察功能的固化程度.
3.2 .体积变化在吸水
从傅里叶变换近红外光谱在不同的浸泡时间是有可能的获取信息的数量变化如下吸水.根据朗伯一比尔定律,吸光度在某波,阿,被吸收发生数目成正比吸收物种perunit节.因此,一个3月2日应的数量成正比,其中吸收物种分布.如果我们选择一些具体的波红外光谱的整洁树脂,充分远离吸收水分子,我们可以衡量分数体积变化使用以下表达式：
有在A0和吸光度的综合参考频带4623厘米- 1 ,浸泡时间吨= 0和T ,ΔV/V0the分数体积变化下列吸水.图.3 ,体积变化的分数是阴谋反对浸泡时间.