RING-OPENING METATHESIS POLYMERIZATION OF OMEGA-NORBORNENYL POLYSTYRENE MACROMONOMERS AND CHARACTERIZATION OF THE CORRESPONDING STRUCTURES
RING-OPENING METATHESIS POLYMERIZATION OF OMEGA-NORBORNENYL POLYSTYRENE MACROMONOMERS AND CHARACTERIZATION OF THE CORRESPONDING STRUCTURES
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DOI：
10.1002/masy.19950950114
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发表时间：
1995-06-01
影响因子：
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通讯作者：
FONTANILLE, M
中科院分区：
文献类型：
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作者：
BREUNIG, S;HEROGUEZ, V;FONTANILLE, M
以Schrock络合物为引发剂，在活性条件下，通过开环复分解使摩尔质量为2700 ~ 11000 g/mol的ω-降冰片烯基聚苯乙烯（PS）大分子单体聚合。所获得的样品已通过连接到尺寸排阻色谱（SEC）仪器的出口的多角度激光散射（MLLS）检测器进行了表征。聚合度（n）的实验值与预期值基本一致。所形成的各种支化物种的紧密性，其涵盖了广泛的链段密度（rho（s）），被发现取决于两个因素，即它们的聚合度和初始大分子单体的大小。还测定了聚大分子单体的均方回转半径（（B））与相同摩尔质量的线性PS同系物的均方回转半径（（1））的比值（g）。绘制g与聚大分子单体的（n）的变化给出了这些支化结构所采用的构象的概念。
omega-Norbornenyl polystyrene (PS) macromonomers whose molar masses range from 2700 to 11000 g/mole have been polymerized under living conditions by ring-opening metathesis, with a Schrock complex as initiator. The samples obtained have been characterized by a multiangle laser light scattering (MLLS) detector connected to the outlet of a size exclusion chromatography (SEC) instrument. The experimental values of the degree of polymerization ((n)) lie in close agreement with the expected ones. The compactness of the various branched species formed, which covers a wide range of segment densities (rho(s)), is found to depend on two factors that are their degree of polymerization and the size of the initial macromonomer. The ratio (g) of the mean-square radii gyration ((b)) of polymacromonomers to those ((1)) of linear PS homologues of same molar mass was also determined. Plotting the variation of g vs. the (n)'s of polymacromonomers gives an idea of the conformation adopted by these branched structures.