引言 高分子的物理性质可设想为其链原子三维空间排列或构型的一种反映。而构型则唯一地依赖于链的化学结构。因此链状分子的不同化学本质,表现出不同的宏观性质。对生物高分子而言,其物理性质和生物活性都是链的三维空间排列的函数。实际上,生物高分子由于溶剂和热的作用而改变其空间构型时,它的生物功能常常遭到破坏。 Introduction The physical properties of polymers can be envisioned as a reflection of the three-dimensional arrangement or configuration of their chain atoms. The configuration, however, depends solely on the chemical structure of the chain. Therefore, the different chemical nature of chain molecules, showing different macro-nature. For biopolymers, both their physical properties and biological activity are functions of the three-dimensional arrangement of chains. In fact, biopolymers are often destroyed in their biological function when their spatial configuration is altered by the action of solvents and heat.