Melt Miscibility in Diblock Copolymers Containing Polyethylene and Substituted Hydrogenated Polynorbornenes
Melt Miscibility in Diblock Copolymers Containing Polyethylene and Substituted Hydrogenated Polynorbornenes
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含有聚乙烯和取代的氢化聚降冰片烯的二嵌段共聚物的熔体混溶性
DOI：
10.1021/acs.macromol.7b01295
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发表时间：
2017
期刊：
影响因子：
5.5
通讯作者：
R. Register
中科院分区：
文献类型：
--
作者：
W. Mulhearn;R. Register
线性聚乙烯（PE）和通过开环易位聚合制备的氢化聚异戊二烯家族的成员之间的热力学相互作用强度可以通过在5位处附加到聚异戊二烯主链的取代基的选择而在宽范围内调谐。异丙基和某些正烷基产生与PE高度混溶的聚异戊二烯，能够在超过100 kg/mol的分子量下产生具有均匀熔体的对称二嵌段共聚物。相比之下，苯基取代的聚异戊二烯与PE是相当不混溶的，在低至10 kg/mol的二嵌段分子量下在熔体中表现出微相分离。这一系列的聚合物内的相互作用强度不定量服从定期混合，熵的贡献所产生的自由体积和链刚度不匹配的混合能量不能解释所观察到的偏差。相反，相互作用可以令人满意地描述的经验混合规则的t…
The thermodynamic interaction strengths between linear polyethylene (PE) and members of a family of hydrogenated polynorbornenes prepared by ring-opening metathesis polymerization can be tuned across a wide range via the choice of substituent appended to the polynorbornene backbone at the 5-position. Isopropyl and certain n-alkyl groups yield polynorbornenes that are highly miscible with PE, capable of producing symmetric diblock copolymers with homogeneous melts at molecular weights in excess of 100 kg/mol. In contrast, phenyl-substituted polynorbornenes are quite immiscible with PE, exhibiting microphase separation in the melt at diblock molecular weights as low as 10 kg/mol. Interaction strengths within this series of polymers do not quantitatively obey regular mixing; entropic contributions to the mixing energy arising from mismatches in free volume and chain stiffness cannot account for the observed deviations. Instead, the interactions can be satisfactorily described by an empirical mixing rule of t...
影响因子：
8.6
作者：
Glaser, Jens;Medapuram, Pavani;Morse, David C.
通讯作者：
Morse, David C.
影响因子：
8.6
作者：
Matsen, M. W.
通讯作者：
Matsen, M. W.