【摘要】 采用动态力学和应力-应变法,研究了镍系顺丁橡胶（Ni-BR）的长链支化对动态模量、缠结链段数目及其分子量等因素的影响。认为Ni-BR的支化度大者,动态模量、屈服强度、T₃₀₀/σ_y值高,缠结链段分子量小,缠结链段数止多,本体粘度大,缠结网络紧密,分子运动和解缠结困难,橡胶的结晶能力降化,甚至不能结晶。更多还原

【Abstract】 The effects of long chain branching of nickel-catalyst polybuladiene ( Ni-BR ) on viscoelastic properties, crystallization, the segment number and molecular weight of entanglement were studied by using dynamics and stress-strain methods.When the branching degree of Ni-BR was larger, the values of dynamic modulus, yield strength and T300/σy were higher, the molecular weight of entanglement was less but the segment number higher, bulk viscosity was larger, and the entanglement network was dense,so it was resulted in difficult for molecular motion and disentanglement, and the crystallizability of rubber decreased, or even could not be crystallized.更多还原