Differential scanning calorimetry analysis of silicon-containing and phosphorus-containing segmented polyurethane. I—Thermal behaviors and morphology
Differential scanning calorimetry analysis of silicon-containing and phosphorus-containing segmented polyurethane. I—Thermal behaviors and morphology
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DOI：
10.1002/app.1805
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发表时间：
2001-09
影响因子：
3
通讯作者：
M. Lin;Y. Shu;Wen‐Chin Tsen;Fu-Sheng Chuang
中科院分区：
文献类型：
--
作者：
M. Lin;Y. Shu;Wen‐Chin Tsen;Fu-Sheng Chuang
利用差示扫描量热法（DSC）研究了含硅和含磷分段聚氨酯（Si-PU和P-PU）的热转变和形貌。所研究的Si-PU和P-PU聚合物的硬段分别由4,4 ' -二苯基甲烷二异氰酸酯（MDI）和二苯基硅二醇（DSiD）、MDI和甲基磷酸（MPA）组成。这些聚合物的软段由聚四甲基醚乙二醇组成，平均分子量为1000或2000 （PTMG 1000和PTMG 2000分别）。Si-PU和P-PU聚合物上出现了几个热转变，反映了软段和硬段相。硬段含量较低的Si-PU和P-PU聚合物表现出高度的相分离，这从软段玻璃化转变温度（Tgs）和过渡区宽度（ΔB）的恒定可以看出。以PTMG 2000为软段的聚合物普遍表现出10℃左右的结晶熔融吸热，而熔体淬火后结晶通常消失。Si-PU和P-PU聚合物的硬段表现出多重吸热。第一个恒温动物属于硬段结构域的近程排序（I区），第二个恒温动物属于长程排序（II区）。广角x射线表明，I区和II区结构几乎完全无定形。©2001 John Wiley & Sons, Inc生物质化学工程学报，2009,31 (2):389 - 391
This article investigated thermal transition and morphology utilizing differential scanning calorimetry (DSC), which was performed on silicon-containing and phosphorus-containing segmented polyurethane (Si-PU and P-PU). The hard segments of those Si-PU and P-PU polymers investigated consisted of 4,4′-diphenylmethane diisocyanate (MDI) and diphenylsilanediol (DSiD), MDI, and methylphosponic (MPA), respectively. The soft segment of those polymers comprised polytetramethylene ether glycol, with an average molecular weight of 1000 or 2000 (PTMG 1000 and PTMG 2000, respectively). Several thermal transitions appeared for on the Si-PU and P-PU polymers, reflecting both the soft-segment and hard-segment phases. The Si-PU and P-PU polymers with a lower hard-segment content exhibited a high degree of phase separating as indicated by the constancy of both the soft-segment glass transition temperature (Tgs) and the breadth of transition zone (ΔB). The polymers in which PTMG 2000 was used as the soft segment generally exhibited a crystalline melting endotherm about 10°C, while crystallization usually disappeared upon melt quenching. The hard segments of the Si-PU and P-PU polymers displayed multiple endotherms. The first endotherm was related to a short-range ordering of the hard segment domain (Region I), and the second endotherm was ascribed to a long-range ordering of the domain (Region II). The wide-angle X-ray demonstrated that the structure in Region I and Region II was almost completely amorphous. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 3489–3501, 2001