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所谓展望是有时间长短的问题。展望几天后的事情是有风险的。展望几十年后的事情,这样的风险就没有了。因此,谁都能说一说一千年后的事情。倒退到1920年,来看未来的事物,当时,存在的几种纤维,也就是看到的只是天然纤维的棉花与羊毛和人造纤维的人造丝和醋酸纤维的性质。那时,纤维的最高模量是60克/(代糸),应强度约为2克/(代糸),当时最高的断裂伸长约为20％。
The so-called outlook is a matter of time. Looking forward to a few days after things are at risk. Looking forward to a few decades later, there is no such risk. Therefore, no one can say anything about a thousand years later. Back in 1920, look at the future, when the existence of several fibers, that is, only to see the natural fiber cotton and wool and rayon rayon and cellulose acetate nature. At that time, the maximum modulus of the fibers was 60 g / (generation) and the strength should be about 2 g / (generation), with the highest elongation at break of about 20%.