Elasticity and Thermodynamic Equilibrium of a Crosslinked Polymer Melt
學年 86
學期 2
發表日期 1998-03-01
作品名稱 Elasticity and Thermodynamic Equilibrium of a Crosslinked Polymer Melt
作品名稱（其他語言）
著者 Joos, Bela; Zhou, Zi-cong
作品所屬單位 淡江大學物理學系
出版者
會議名稱
會議地點 Los Angeles, CA, USA
摘要 We have calculated by two different methods the shear modulus of a crosslinked polymer melt near the onset of rigidity, using molecular dynamics simulation. A macroscopic measurement called E from a volume preserving deformation yields a very slowly convergent average value. From an equilibrium fluctuation method, which probes the microscopic response of the system to deformation, significant variations in the average shear modulus mu are observed. And mu, after several million time steps, moves among values much smaller than E. A partitioning of the system into smaller cells reveals a constantly evolving system with regions of negative shear modulus corresponding to local structural changes. For a homogeneous system the two approaches will give equal results. For an inhomogeneous system, different values are expected, but if there is a well established ground state, mu should be larger than E, in the case of a system near percolation. We conclude from our study that the crosslinked polymer melt does not reach a well defined thermodynamic state, but oscillates continuously between several states in a manner reminiscent of a structural glass.
關鍵字
語言 en
收錄於
會議性質 國內
校內研討會地點
研討會時間 19980301~19980301
通訊作者
國別 USA
公開徵稿 Y
出版型式 紙本
出處 APS-98 March Meeting,Los Angeles Convention Center,
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