【摘要】 <正> 从研究聚乙烯由球晶结构转变到纤维结构的过程得知,聚乙烯纤维由一束平行排列的细纤维(microfibril)组成,细纤维则由垂直于纤维轴互相平行排列的折迭链块(foldedchain block)组成,折迭链块之间有链段相连.处于高弹态的天然橡胶(-78°—28℃),进行单向拉伸,可发生取向并同时结晶,形成纤维,但是它与聚乙烯的起始态不同,为阐明天然橡胶拉伸后是否也有类似聚乙烯纤维的结构单元,本文采用透射式电子更多还原

【Abstract】 The crystallization and orientation of natural rubber under uniaxial drawing were investigated by the electron microscope. From electron microscope and electron diffraction pattern it is revealed that the structure of the fibre from natural rubber is similar to that of the polyethylene fibre. Its basic structural element is also micro-fibril, highly aligned in the draw direction and the microfibril is formed by the folded chain blocks, aligned perpendicular to the draw direction. Thus it seems to be reasonable that the structural model of polyethylene mierofibril could be considered as a general model for crystalline fibres of such linear polymers.更多还原