Synthesis of Poly(1,3-cyclohexadiene) Containing Star-Shaped Elastomers

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外文摘要：The synthesis of high molecular weight star-shaped polymers comprising poly(1，3-cyclohexadiene-block-isoprene) diblock arms coupled to a divinyl benzene (DVB) core is reported。 The number average molecular weights of the diblock arms were varied from 30000 to 50000 and the ratio of DVB to n-butyllithium (nBuLi) was systematically varied from 3:1 to 12:1。 Size exclusion chromatography coupled with light scattering detection was utilized to detect the formation of star-shaped polymers and the presence of star-star coupling。 The molecular weight distribution (< M_w > / < M_n >) of the star polymers ranged from 1。25 to 1。50。 The effect of poly(1，3-cyclohexadiene) content on the mechanical properties of these novel elastomers is reported。 The elastic modulus， elongation at break， and tensile strength of these elastomers were all found to be a function of the percentage of poly(1，3-cyclohexadiene)。 The glass transition temperatures were determined using both differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA)。 Atomic force microscopy was performed in the tapping mode (TMAFM) to verify the presence of microphase separation。

外文关键词：

anionic polymerizationatomic force microscopy1,3-cyclohexadienestar-shaped polymerthermoplastic elastomer

作者：

D. T. Williamson、T. E. Long

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作者单位：

Virginia Polytechnic University and State University, Department of Chemistry, Polymer Materials and Interfaces Laboratories, Blacksburg, VA 24061-0212, USA

会议名称：

Proceedings of the 2003 International Symposium on Ionic Polymerization and Related Processes

会议地点：

Boston,MA(US)

会议母体文献：

Macromolecular Symposia 215; International Symposium on Ionic Polymerization and Related Processes; 20030630-0704; Boston,MA(US)

页码：

P.95-109

出版时间：

2003