Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Viale Teresa Michel 5, 15121 Alessandria, Italy.
Carbohydr Polym. 2013 Jul 1;96(1):296-304. doi: 10.1016/j.carbpol.2013.03.066. Epub 2013 Mar 28.
In the present work, the effect of different DNA add-ons (namely, 5, 10 and 19 wt.%) has been thoroughly investigated as far as the flammability and the resistance to an irradiating heat flux of 35 or 50 kW/m(2) are considered. The results have shown that 10 wt.% is the minimum amount that allows reaching the self-extinguishment of cotton when a methane flame is applied. Furthermore, only 19 wt.% is able to confer resistance to the fabric towards an irradiating heat flux of 35 kW/m(2): indeed, the specimens tested under the cone calorimetry do not burn. Measurements of temperature runs as a function of time have clearly indicated that cotton, instead of burning, pyrolyses: indeed, because of the protective role exerted by DNA molecules, the deposited coatings have turned out to absorb heat, form char and induce its formation on the fabric, and finally to release inert gases.
在本工作中，我们深入研究了不同 DNA 添加剂（即 5wt%、10wt%和 19wt%）对可燃性和抵抗 35kW/m(2)或 50kW/m(2)辐照热通量的影响。结果表明，当施加甲烷火焰时，10wt%是使棉花达到自熄所需的最小添加量。此外，只有 19wt%能够使织物抵抗 35kW/m(2)的辐照热通量：实际上，在锥形量热仪下测试的样品不会燃烧。随着时间的温度测量清楚地表明，棉花不是燃烧而是热解：实际上，由于 DNA 分子发挥的保护作用，沉积的涂层吸收热量，形成炭并在织物上诱导其形成，最终释放惰性气体。
