Morphological analysis of telechelic ureidopyrimidone functional hydrogen bonding linear and star-shaped poly(ethylene-co-propylene)s
Morphological analysis of telechelic ureidopyrimidone functional hydrogen bonding linear and star-shaped poly(ethylene-co-propylene)s
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DOI：
10.1002/marc.200700331
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发表时间：
2007-08-14
影响因子：
4.6
通讯作者：
Long, Timothy E.
中科院分区：
文献类型：
--
作者：
Mather, Brian D.;Elkins, Casey L.;Long, Timothy E.
用小角X射线散射和原子力显微镜研究了分子量在12 ~ 90 K、分子量分布窄（PDI =（M）/bar（w）/（M）/bar（n），< 1.10）的脲基嘧啶酮（UPy）末端官能化的线型和星形乙烯-丙烯共聚物（氢化聚异戊二烯）。这些氢键末端官能化的聚合物（0.45- 1.14mol.-% UPy端基）出乎意料地表现出微相分离的结构域，其结构域间间距为约10-15 nm，表明氢键端基的固态聚集超过了简单的二聚化。从SAXS测量获得的域间间距系统地增加分子量和减少单官能低聚物相对于相同分子量的遥爪类似物。变温AFM测量证实了在星形UPy末端官能聚（乙烯-共-丙烯）的表面处存在微相分离，并揭示了在加热至130 ° C时相衬的降低，同时保留了微相分离的织构。
Ureidopyrimidone (UPy) end-functionalized linear and star-shaped poly(ethylene-co-propylene)s (hydrogenated polyisoprene) with molecular weights between 12K and 90K and narrow molecular weight distributions (PDI = (M) over bar (w)/(M) over bar (n), < 1.10) were studied with SAXS and AFM. These hydrogen bond end-functionalized polymers (0.45-1.14 mol.-% UPy end-groups) unexpectedly exhibited microphase separated domains with interdomain spacings of approximately 10-15 nm suggesting a solid-state clustering of the hydrogen bonding end-groups beyond simple dimerization. The interdomain spacings that were obtained from SAXS measurements systematically increased with molecular weight and decreased for monofunctional oligomers relative to telechelic analogs of the identical molecular weight. Variable temperature AFM measurements confirmed the presence of microphase separation at the surface for the star-shaped UPy end-functional poly(ethylene-co-propylene) and revealed a decrease in phase contrast upon heating to 130 degrees C with retention of the microphase separated texture.