CAJ | 학술논문

采用自制醋化级竹浆粕制取三醋酸纤维素,探讨制备过程中不同活化工艺及醋化工艺下制得三醋酸纤维素聚合度及取代度的变化情况,通过确定适合的聚合度及取代度优化制备工艺。研究表明活化过程中加大活化剂醋酸的用量对聚合度影响不大,取代度则为先随醋酸用量增大而增大,而后反而有所下降;活化过程中温度、时间、浓硫酸用量各因素的提高均可增加三醋酸纤维素的取代度,但均会使聚合度降低;另外在醋化反应中分别提高醋化温度、时间、醋酸、醋酐及浓硫酸用量同样可增加三醋酸纤维素的取代度,但也同样会导致聚合度的降低。
채용자제작화급죽장박제취삼작산섬유소,탐토제비과정중불동활화공예급작화공예하제득삼작산섬유소취합도급취대도적변화정황,통과학정괄합적취합도급취대도우화제비공예。연구표명활화과정중가대활화제작산적용량대취합도영향불대,취대도칙위선수작산용량증대이증대,이후반이유소하강;활화과정중온도、시간、농류산용량각인소적제고균가증가삼작산섬유소적취대도,단균회사취합도강저;령외재작화반응중분별제고작화온도、시간、작산、작항급농류산용량동양가증가삼작산섬유소적취대도,단야동양회도치취합도적강저。
Cellulose triacetate（CTA）was prepared from high grade dissolving pulp from bamboo.Influences of different activation and acetylization processes on degree of polymerization（DP）and substitution degree（DS）of CTA were investigated,with aim to optimize the whole preparation process.The results showed that in activation process,DP was slightly influenced by acetic acid,while DS first increased and then decreased by increasing concentration of acetic acid.It was also showed that DS could be enhanced dramatically by increasing activation temperature,time and the concentration of H2SO4 respectively,DP however was quite opposite.Furthermore,in acetylization process,DS increased with temperature,time,concentration of acetic acid,acetic anhydride and H2SO4increasing respectively,while DP was opposite.