为提高二醋酸纤维素片的国产化率,通过凝胶渗透色谱、红外光谱、X射线衍射、差示扫描量热等方法表征了国产棉浆醋片、国产木浆醋片(瑞安)和进口木浆醋片(巴西、挪威)的结构,并通过旋转流变仪测定4种醋片的流变性能。结果表明:棉浆醋片分子量和乙酰化程度居中,但结晶性较强。分子量较低的棉浆纺丝液表观黏度对高剪切速率的响应较慢,且下降幅度少。因其黏度变化稳定,有利于纺丝过程的控制,增加纺速的可调性,提高产量。同时,棉浆醋片因较高的结晶性,纺丝液中可能存在微晶,形成物理缠结点,亦表现出较大的剪切应力,有助于提高成纤强力。
In order to realize domestic production of cellulose diacetate tablets with high quality,gel permeation chromatography,infrared spectroscopy,X-ray diffractometer and differential scanning calorimeter were used to characterize the structure of domestic cotton pulp diacetate tablets,domestic wood diacetate tablets (Ru'an) and imported wood diacetate tablets (Brazil and Norway).The rheological properties of the four tablets were measured by rotational rheometer.The results showed that the molecular weight and acetylation degree of cotton pulp diacetate tablets were in the middle,but the crystallinity was relatively high.The apparent viscosity of cotton pulp diacetate tablets solution with lower molecular weight responded slowly to high shear rate and decreased less.Due to such a property,it was conducive to the adjustability of spinning speed,reduction of energy consumption and improvement of the output.Meanwhile,due to the high crystallinity of cotton pulp diacetate tablets,microcrystals might exist in the spinning solution to form physical entanglements points among molecules,exhibiting greater shear stress that helped to improve the fiber strength.
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基金资助
中央高校基本科研基金项目(JUSRP51907A);111计划(B17021);江南大学基本科研计划(JUSRP12030);江南大学-南通醋酸纤维有限公司专项技术服务项目(201497)
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