Differential Scanning Calorimetry Study of Blends of Poly(ethylene glycol) with Selected Fatty Acids
Differential Scanning Calorimetry Study of Blends of Poly(ethylene glycol) with Selected Fatty Acids
复制标题
DOI：
10.1002/mame.200390022
复制
发表时间：
2003-03
影响因子：
3.9
通讯作者：
K. Pielichowski;K. Flejtuch
中科院分区：
文献类型：
--
作者：
K. Pielichowski;K. Flejtuch
通过差示扫描量热法（DSC）研究了一系列不同分子量的聚乙二醇（PEG）与（i）癸酸、（ii）月桂酸、（iii）肉豆蔻酸、（iv）棕榈酸或（v）硬脂酸的共混物作为热能储存材料。相变温度和相变潜热的PEG，脂肪酸和它们的二元共混物的测定，因为这些属性是在相变储能材料的设计中的首要重要性。实验结果表明，通过在熔体中混合并随后固化，可以获得均匀的（如DSC数据所示）聚合物/脂肪酸共混物。PEG/脂肪酸体系的熔点范围为30 ~ 72°C，而其转变热为168-208 J·g-1。对于PEG 10 000/硬脂酸共混物，发现组分的协同作用-转变热为约1000。分别比纯硬脂酸和PEG高15和35%。这一现象可以解释为通过氢键加强特定的相互作用，从而形成更完美的晶格。
a series of blends of poly(ethylene glycol) (PEG) with different molecular weights with: (i) capric, (ii) lauric, (iii) myristic, (iv) palmitic or (v) steraric acid, as a thermal energy storage material, has been investigated by differential scanning calorimetry (DSC). Transition temperatures and latent heat of transition of PEG, fatty acids and their binary blends were determined since these properties are of primary importance in the design of phase change energy storage materials. The experimental results showed that iy is possible to obtain homogeneous (as indicated by DSC data) polymer/fatty acid blends by mixing in the melt and subsequent solidification. The melting ranges of PEG/fatty acid systems were observed to be from 30 to 72°C while their heat of transition lies in the range of 168-208 J.g -1 . Synergistic action of the components was found for PEG 10 000/steric acid blend - heat of transition was ca. 15 and 35% higher than for pure stearic acid and PEG, respectively. This phenomena may be explained in terms of strengthened specific interactions via hydrogen bonding leading to formation of more perfect crystalline lattice.