Fig. 1. (a) Schematic diagram of polymer melts under shear flow; (b) evolutions of σ_xy, R_ete and P_all for polymer melts under shear with temperature of T = 1.0. (a)高分子熔体剪切示意图; (b)高分子熔体在剪切场温度为T = 1.0下的σ_xy, R_ete及P_all演化曲线

Fig. 2. Schematic diagram of (a) centro-symmetry parameter and (b) stretched chain segment for PVA crystal; (c) S distribution of crystal and melt of PVA semicrystalline polymers. (a)成核原子判定方法示意图; (b)伸直链判定方法示意图; (c) PVA半晶态高分子结构晶区与无定型区S值的分布

Fig. 3. Evolutions of , d_tt, V and S of nucleation atoms under different stains: (a) γ = 0; (b) γ = 1; (c) γ = 1.5; (d) γ = 2; (e) γ = 4; (f) γ = 8. 不同应变下PVA熔体的 , d_tt, V和S随时间的演化过程　(a) γ = 0; (b) γ = 1; (c) γ = 1.5; (d) γ = 2; (e) γ = 4; (f) γ = 8

Fig. 4. (a) Schematic diagram of crystalline and amorphous chain structure for the semicrystalline polymers; (b) and (c) atomic structure of crystal and melt of PVA semicrystalline polymers.(a)半晶态高分子结构中无定型对应的链结构分类模型; (b), (c) PVA半晶态高分子结构中晶体和无定型的原子结构

Fig. 5. (a) , crystalline order parameter P_c, and amorphous order parameter P_a for PVA semicrystalline polymers with different shear strains; (b) the evolution of the numbers of amorphous chains for PVA semicrystalline polymers with different shear strains. (a)不同剪切应下PVA半晶态高分子对应的 、晶体取向参数P_c和无定型结构取向参数P_a; (b)不同剪切应变下PVA半晶态高分子无定型链结构数目的演化

Fig. 6. Stress-strain curves of PVA semicrystalline polymer with different orientation degree under the stretched rate of . 不同预取向半晶态高分子结构在恒定速率为 拉伸场下对应的应力-应变曲线

Fig. 7. Structural evolution of single PVA chain as a function of strain ε when γ = 6. 当γ = 6时对应的单链构象随着应变ε的演化过程