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《工程塑料应用》 2020年第06期
DOI:10.3969/j.issn.1001-3539.2020.06.019
聚乳酸/改性纤维素纳米晶的热稳定性和结晶性能
张春梅1,宋玉1,刘双会1,龙明芬1,李丹青1,翟天亮2
1.贵阳学院化学与材料工程学院,贵阳 550005; 2.贵州师范学院化学与材料学院,贵阳 550018 
Thermal Stability and Crystallization Properties of Polylactide/Modified Cellulose Nanocrystals
Zhang Chunmei1, Song Yu1, Liu Shuanghui1, Long Mingfen1, Li Danqing1, Zhai Tianliang2
1. College of Chemistry and Materials Engineering, Guiyang University, Guiyang 550005, China; 2. Guizhou Building Material Quality Supervision Testing Center, Guiyang 550018, China 
摘要:采用简单的溶液混合将纤维素纳米晶(CNC)与聚乙二醇(PEG)复合后得到改性的纤维素纳米晶(CNC-PEG)粒子,将其与PLA熔融共混,得到PLA/CNC-PEG纳米复合物。采用热重(TG)分析仪表征了PLA/CNC-PEG纳米复合物的热稳定性,采用示差扫描量热(DSC)仪研究了PLA/CNC-PEG纳米复合物分别在不同升温速率下的非等温结晶行为。结果发现,CNC-PEG中PEG的影响使得PLA/CNC-PEG纳米复合物的热稳定性略高于纯PLA。引入CNC-PEG后,PLA/CNC-PEG (0.5%)纳米复合物的玻璃化转变温度(Tg)比纯PLA高,随着CNC-PEG含量的增加,共混物的Tg又随之降低。PLA/CNC-PEG纳米复合物的结晶温度(Tp)比纯PLA低,且随CNC-PEG含量的增加,共混物的Tp进一步降低。采用Kissinger公式对各样品的非等温结晶过程进行拟合,发现CNC-PEG降低了PLA 的结晶活化能,而随CNC-PEG含量的增加,PEG的增塑作用使PLA的结晶活化能升高。 
Abstract:Modified CNC-PEG nanoparticles were obtained by simply solution mixing cellulose nanocrystals (CNC) with polyethylene glycol (PEG). Then, by melt blending them with PLA, PLA/CNC-PEG nanocomposites were obtained. Thermogravimetric analyzer (TG) was used to characterize the thermal stability of PLA/CNC-PEG nanocomposites. Differential scanning calorimetry (DSC) was used to study the non-isothermal crystallization behavior of PLA and different proportional PLA/CNC-PEG nanocomposites at different heating rates. The results show that the thermal stability of PLA/CNC-PEG nanocomposites is slightly higher than that of pure PLA, due to the impact of PEG in CNC-PEG. By the addition of CNC-PEG, the glass transition temperature (TTg) of PLA/CNC-PEG(0.5%) nanocomposite is higher than that of PLA. However, the Tg of the blend decreased with increasing the content of CNC-PEG. The crystallization temperature (Tp) of PLA/CNC-PEG nanocomposites is lower than that of pure PLA, and the Tp of the blends is further decreased with the increase of CNC-PEG content. The Kissinger formula was used to fit the non-isothermal crystallization process of each sample, and it was found that CNC-PEG decreased the crystallization activation energy of PLA, and as the content of CNC-PEG increased, the crystallization activation energy of PLA increased due to the plasticizing effect of PEG. 
关键词:聚乳酸;纤维素纳米晶;非等温结晶;结晶活化能 
Keywords:polylactide; cellulose nanocrystals; non-isothermal; crystallization activation energy 
基金:贵阳市财政支持贵阳学院学科与硕士点建设项目(HC-2019),国家自然科学基金项目(51703038),贵州省科技厅学术新苗培养及创新探索专项项目(GYU-KJT[2019]-14) 
本文引用格式:
张春梅,宋玉,刘双会,等.聚乳酸/改性纤维素纳米晶的热稳定性和结晶性能[J].工程塑料应用,2020,48(6):103-107.
Zhang Chunmei,Song Yu,Liu Shuanghui,et al. Thermal stability and crystallization properties of polylactide/modified cellulose nanocrystals[J]. Engineering Plastics Application,2020,48(6):103-107. 

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