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首页> 外文期刊>Journal of Polymers and the Environment >Effect of Cobalt Oxide Nanoparticles on the Nano-scale Free Volume and Optical Properties of Biodegradable CMC/PVA Films
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Effect of Cobalt Oxide Nanoparticles on the Nano-scale Free Volume and Optical Properties of Biodegradable CMC/PVA Films

机译：氧化钴纳米颗粒对可生物降解CMC / PVA薄膜的纳米尺度自由体积和光学性质的影响

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Chemically prepared cobalt oxide nanoparticles (NPs) were added to biodegradable carboxymethyl cellulose (CMC) (20%)/polyvinyl alcohol (PVA) (80%) blend films. The structural properties of these films were investigated by X-ray diffraction, Fourier transformation infrared spectroscopy (FTIR) and differential thermal analysis (DTA). Co~(3)O~(4)/(CMC + PVA) films show a semi-crystalline structure and the degree of crystallinity decreases with adding Co~(3)O~(4)NPs. FTIR confirms the good interaction between the blend chains and Co~(3)O~(4)NPs. The melting temperature T~(m)for CMC/PVA is about 212 °C then decreased with increasing Co~(3)O~(4)content, due to some decrease in the ordered association of the blend which results in a decrease in the blend crystallinity. Positron annihilation lifetime spectroscopy (PALS) measurements were carried out with a conventional fast–fast coincidence spectrometer. It was found that ortho- positronium lifetime τ ~( 3 )and free volume V~(f)increase while o-Ps intensity I~(3)still constant as Co~(3)O~(4)concentration increases. This is because adding Co~(3)O~(4)NPs encourages the formation of o-Ps. The swelling ratio SR% as a function of Co~(3)O~(4)concentration was also studied and its value increases with Co~(3)O~(4)addition. The optical study illustrated the decrease of the transmittance T of the films from 87 to 35.5% with increasing Co~(3)O~(4)content from 0 to 0.9 wt%. Also, both the direct and indirect optical band gaps of the films red-shifted from 4.05 to 3.75 eV and 3.3 to 2.75 eV, respectively. The influence of Co~(3)O~(4)on the refractive index of the films is also reported.
机译：将化学制备的氧化钴纳米颗粒（NPs）添加到可生物降解的羧甲基纤维素（CMC）（20％）/聚乙烯醇（PVA）（80％）混合膜中。通过X射线衍射，傅立叶变换红外光谱（FTIR）和差热分析（​​DTA）研究了这些薄膜的结构性能。 Co〜（3）O〜（4）/（CMC + PVA）薄膜呈半结晶结构，其结晶度随添加Co〜（3）O〜（4）NPs而降低。 FTIR证实了共混链与Co〜（3）O〜（4）NP之间的良好相互作用。 CMC / PVA的熔融温度T〜（m）约为212°C，然后随着Co〜（3）O〜（4）含量的增加而降低，这是由于共混物的有序缔合有所减少，导致了共混物的结晶度。正电子an没寿命谱仪（PALS）的测量使用常规的快速重合光谱仪进行。研究发现，随着Co〜（3）O〜（4）浓度的增加，邻位正电子的寿命τ〜（3）和自由体积V〜（f）均增加，而o-Ps强度I〜（3）仍保持恒定。这是因为添加Co〜（3）O〜（4）NPs会促进o-Ps的形成。还研究了溶胀率SR％随Co〜（3）O〜（4）浓度的变化，溶胀率SR％随Co〜（3）O〜（4）的添加而增加。光学研究表明，随着Co〜（3）O〜（4）含量从0到0.9wt％的增加，薄膜的透射率T从87降低到35.5％。同样，薄膜的直接和间接光学带隙分别从4.05到3.75 eV和3.3到2.75 eV红移。还报道了Co〜（3）O〜（4）对薄膜折射率的影响。

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