受地理环境限制，我国天然橡胶（NR）的自给率已低于安全警戒线。合成聚异戊二烯（IR）是NR的最佳替代物，但是当NR橡胶烃分子结构完全被IR仿制后，二者仍然显著的性能差异被归因于NR的非胶成分。按照最新认识，NR非胶成分主要包含蛋白质，磷脂及少量脂肪酸等，但是其赋予橡胶烃优异性能的结构功能还不清楚。.拟采用NR为基体设计制备包含磷脂（脂肪酸），包含磷脂（脂肪酸）和蛋白质，和两者皆不包含的模型物；通过对IR进行端基修饰，制备对应IR模型物；由此建立精细的对比体系。采用原位同步辐射宽角X衍射和原位介电松弛谱，研究模型物在单轴拉伸条件下的应变结晶行为；采用小角中子散射，一维介电松弛谱和本组发展的二维介电松弛谱揭示各非胶成分对网络的贡献，网络链非均匀性结构变化对应变诱导结晶行为的影响,以及后者与橡胶力学性能疲劳性能的关系，探讨由IR制备“集成天然橡胶”的原理，为从加工改进IR性能提供依据。

Because yield of NR from biosynthesis is restricted by geographical environment, a self-providing ratio for NR in Chain is far below security cordon. It has been realized that an artificially synthesized polyisoprene rubber (IR) is optimal substitute for NR, however, after rubber hydrocarbon in NR is copied completely by IR, the diversity of both rubber in properties still is prominent, which is attributed to non-rubber components in NR. The latest investigations suggest that the non-rubber components mainly consist of proteins, phospholipids and a small quantity of fatty acids, yet it is still unclear what structures and functions of the non-rubber components endow NR with excellent performances..In the project, we plan to construct series of model systems which are derived from either NR or IR for elaborate comparision. The first systems from NR comprise the models containing only phospholipids（fatty acid）, containing both phospholipids (fatty acid)and proteins，and containing neither. The second system is prepared from the synthesized IR with modification of the end groups. The strain-induced crystallization behaviors under uniaxial tension will be studied by in situ synchrotron wide-angle X-ray diffraction and in situ dielectric relaxation spectroscopy. By employing small-angle neutron scattering and dielectric spectroscopy with the aid of 2D correlation analysis created by our group, the contribution of each non-rubber component to forming the nature networks is going to be revealed, and then the effect of nonuniformity of network chains on strain-induced crystallization behaviors as well as the relationship between the later and mechanical and tired properties of rubber will be investigated. Finally a preparation principle of “composite NR” from IR will be probed for providing basis for improving performance of IR by processing.