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Structure and Properties of Supermolecular Elastomer Formed by Telechelid Polymer and Crystalline Amines

Telechelid聚合物与结晶胺形成的超分子弹性体的结构与性能

基本信息

批准号：
18550197
负责人：
TAKAHASHI Yoshiaki
金额：
$ 2.56万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Characterization of carboxyl-terminated telechelic poly(ethyrene-butylene)(CTPEB) was performed by NMR, GPC, small angle neutron scattering (SANS), and FT-IR. It was clarified that this sample has M_n=2000 and almost 100% telechelic. CTPEB sample was neutralized by octadecylamine (ODA) by two methods, i.e., via solution and melt blending and confirmed that the neutralized samples by both methods have practically the same structure and physical properties. A series of sample with different molar ratio of COOH and NH_2 were prepared and their structure and viscoelastic properties at around room temperature (ca 25 ℃) and elevated temperature (65 or 70℃) were examined. The 1: 1 blend sample did not show elastic behavior at all. When excess ODA was added, the system was elastic substance at low temperature and viscoelastic liquid at high temperature. The transition was reversible. From DSC, XRD, FT-IR analysis, it was revealed that most of ODA are non-crystalline. From SANS measurements, sc … More attering curve similar to aluminum tristearylate/decalin system, which was examined as a reference system and became clear that its viscoelastic behavior is due to entangled wormlike micelle structure generated by aggregation of C_18 residue. Therefore, it was concluded that the elastic behavior of CTPEB/ODA is also due to the network structure generated by aggregation of C_18 residue. Strength of the network structure was examined by strain sweep measurement and found that this system shows plastic flow at low strain (ca. 10%). This value is close to the values obtained for ionomers, which was prepared by neutralization of CTPEB with multivalent metal ions.From the value of plateau modulus, it was speculated that only 10 % of poly(ethyrene-butylene) molecules take bridge conformation while others become loop or dangling ends.When amino residue is replaced by amide, there was only a slight increase of transition temperature. Other model alkanes having polar residues, they showed poor miscibility with CTPEB. On the other hand, their crystalline structure and structural transition are very interesting which can be studied as model system for crystalline polymers. Less

用NMR、GPC、小角中子散射（SANS）和FT-IR等方法对端羧基遥爪聚乙烯-丁烯（CTPEB）进行了表征，结果表明，该材料的Mn =2000，遥爪含量接近100%。CTPEB样品通过两种方法用十八胺（ODA）中和，通过溶液和熔融共混，并证实通过两种方法中和的样品具有实际上相同的结构和物理性质。制备了一系列具有不同COOH和NH_2摩尔比的样品，并研究了它们在室温（约25 ℃）和高温（65或70℃）下的结构和粘弹性能。1：1共混物样品根本不显示弹性行为。当ODA过量时，体系在低温下为弹性体，高温下为粘弹性液体。这种转变是可逆的。DSC、XRD、FT-IR分析表明，ODA大部分为非晶态。根据SANS测量，sc ...更多信息通过与三硬脂酸铝/十氢萘体系的比较，发现该体系的粘弹行为是由于C_18残基聚集形成的蠕虫状胶束结构所致。因此，CTPEB/ODA的弹性行为也是由于C_18残基聚集形成的网络结构所致。通过应变扫描测量检查了网络结构的强度，发现该系统在低应变（约1000）下显示塑性流动。10%）。由平台模量值推测，只有10%的聚（乙烯-丁烯）分子呈桥构象，其余的分子呈环状或悬挂末端，当氨基被酰胺取代时，转变温度仅略有升高.其他具有极性残基的模型烷烃，它们与CTPEB的相容性较差。另一方面，它们的结晶结构和结构转变是非常有趣的，可以作为结晶聚合物的模型系统进行研究。少