采用超声辅助动态分散装置制备石墨烯纳米片/聚乙二醇(GNPs/PEG)复配改性剂,通过熔融共混法制备一系列GNPs/PEG/聚乳酸(PLA)复合材料,在120℃下对样品进行不同时间的退火处理。利用广角X-射线衍射仪(WAXD)和偏光显微镜(POM)分析了复配改性剂GNPs/PEG及退火对PLA结晶行为的影响。结果表明,GNPs/PEG的添加未改变PLA的晶型,随着退火时间的增加,纯PLA结晶的完善程度会进一步提高,GNPs/PEG的添加有利于缩短退火时间;退火30min时,GNPs/PEG/PLA复合材料的晶体较为完善,继续延长退火时间对其晶体形貌几乎没有影响。
Graphene nanosheets (GNPs)/polyethylene glycol (PEG) compound modifier was prepared by ultrasonic assisted dynamic dispersion device,and a series of polylactic acid(PLA)/GNPs/PEG composites were prepared by melt blending,then the samples were annealed at 120 ℃ under different times.The effects of compounding modifier GNPs/PEG and annealing on crystallization behavior of PLA were analyzed by wide angle X-ray diffractometry (WAXD) and polarized light microscopy (POM).The results shown that the introduction of GNPs/PEG did not change the crystal form of PLA,and with increasing of annealing time,the perfect degree of pure PLA crystals was further improved.Meanwhile,after annealing 30min,the crystals of PLA/GNPs/PEG were perfected,while the further extension of annealing time had almost no effect on the crystal.
[1] Tyler B,Gullotti D,Mangraviti A,et al.Polylactic acid (PLA) controlled delivery carriers for biomedical applications[J].Advanced Drug Delivery Reviews,2016,107:163-175.
[2] Wang L X,Wang D F,Zhou Y P,et al.Fabrication of open-orous PCL/PLA tissue engineering scaffolds and the relationship of foaming process,morphology,and mechanical behavior[J].Polymers for Advanced Technologies,2019,30(10):2539-2548.
[3] 曹乐,贾仕奎,张奇锋,等.不同分子量PEG对PLA/GNPs复合材料的结晶及热性能影响[J].化工新型材料,2020,48(2):125-129.
[4] Hong J H,Yu T,Chen Z,et al.Improvement of flexural strength and compressive strength by heat treatment of PLA filament for 3D-printing[J].Modern Physics Letters B,2019,33(14):1-11.
[5] 张伟,宋日恒,刘菲.增塑剂对聚乳酸玻璃化转变温度影响的研究[J].化工新型材料,2019,47(10):203-206,215.
[6] Ying Z,Wu D,Ming Z,et al.Polylactide/basalt fiber composites with tailorable mechanical properties:effect of surface treatment of fibers and annealing[J].Composite Structures,2017,176:1020-1027.
[7] Huda M S,Drzal L T,Mohanty A K,et al.Effect of fiber surface-treatments on the properties of laminated biocomposites from poly(lactic acid) (PLA) and kenaf fibers[J].Composites Science & Technology,2008,68(2):424-432.
[8] Takayama T,Todo M,Tsuji H.Effect of annealing on the mechanical properties of PLA/PCL and PLA/PCL/LTI polymer blends[J].Journal Mechanical Behaviour Biomed Materials,2011,4(3):255-260.
[9] Jang J M,Kim S J,Kang N H,et al.Effects of annealing conditions on microstructure and mechanical properties of low carbon,manganese transformation-induced plasticity steel[J].Metals & Materials International,2009,15(6):909-916.
[10] Nascimento L,Gamez-Perez J,Santana O O,et al.Effect of the recycling and annealing on the mechanical and fracture properties of poly(lactic acid)[J].Journal of Polymers & the Environment,2010,18(4):654-660.
[11] 张艳艳,卓然然,李桂丽,等.退火过程中聚乳酸中间相的形成和结构演化[J].高等学校化学学报,2016,37(3):581-586.
[12] Ge F,Wang X,Ran X.Effect of annealing on the properties of polylactide/poly(butylene carbonate) blend[J].Advances in Polymer Technology,2016,37:214-221.
[13] 朱文利,朱定见.退火处理对挤出发泡聚乳酸结晶度的影响[J].塑料工业,2015,43(11):39-42.
[14] 刘爱平,霍云,李通,等.退火对聚乳酸结晶及耐热性能的影响[J].中国塑料,2015,29(6):44-48.
[15] 常宪增,李诚亮,史新妍.退火对聚乳酸/丙烯酸酯橡胶共混物结晶行为的影响[J].高分子材料科学与工程,2018,34(10):79-83.
