Dynamic viscoelastic measurements were performed for a series of poly(4-n-alkylstyrene)s with six different n-alkyl side chains, that is, methyl, ethyl, propyl, butyl, hexyl and octyl groups. Based on the time-temperature superposition principle, storage modulus G′, loss modulus G″ and loss tangent tan δ were shifted with horizontal shift factor a_T and vertical shift factor b_T, giving well superposed master curves for all the polymers. With increase of the number of carbon atoms, plateau modulus G_N⁰, which corresponds to G′ value at minimum tan δ, decreases, while entanglement molecular weight M_e(=ρRT/G_N⁰) increases, where ρ is the polymer density, R is the gas constant and T is the absolute temperature. Degree of polymerization at onset of entanglement, N_e, which defined as M_e/M₀, where M₀ denotes the molecular weight of each monomer, also increases with increase of n-alkyl side chain length. Packing length estimated from the empirical equation by Fetters also increases with increase of n-alkyl lengths. These results are presumably due to large polymer chain thickness caused directly by substituents on phenyl rings of styrene units.

对具有六个不同的正烷基侧链，即甲基，乙基，丙基，丁基，己基和辛基的一系列聚（4-正烷基苯乙烯）进行动态粘弹性测量。基于所述的时间-温度叠加原理，储能模量G ^ '，损耗模量G ^ “和损耗角正切δ与水平移位因子被转移一个_Ť和垂直移位因子b _Ť，给所有的聚合物以及叠加主曲线。与碳原子的数目，平台模量的增加ģ _Ñ ⁰，这对应于ģ '在最小黄褐色值δ于，降低，而缠结分子量中号_È（= ρRT / ģ _Ñ ⁰）的增加，其中ρ是聚合物密度，- [R是气体常数和Ť是绝对温度。缠结开始时的聚合度N _e，定义为M _e / M ₀，其中M ₀表示每个单体的分子量，也随着正烷基侧链长度的增加而增加。Fetters根据经验方程估算的堆积长度也随着正烷基长度的增加而增加。这些结果推测是由于苯乙烯单元的苯环上的取代基直接引起的大聚合物链厚。