不同相容剂改性PLA/微米CaCO_3的结晶与力学性能
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摘要
为增加PLA/微米CaCO_3复合材料的界面作用,提高PLA韧性,采用POE-g-MAH和EVA-g-MAH增容改性PLA/微米CaCO_3复合材料,并对比研究了两种相容剂对PLA/微米CaCO_3复合材料的结晶和力学性能的影响。DSC和XRD结果证实采用POE-g-MAH增容PLA/微米CaCO_3明显提高PLA的结晶速率和结晶度,当微米CaCO_3填充量为w=40%时,PLA的结晶度从2.0%提高到45.8%;而采用EVA-g-MAH增容PLA/微米CaCO_3对PLA结晶性能影响不大。力学实验表明采用EVA-g-MAH增容PLA/微米CaCO_3复合材料增韧效果优于POE-g-MAH增容PLA/微米CaCO_3复合材料。
In order to strength the interfacial effect of PLA/micro-CaCO_3 and improve the toughness of PLA, PLA/micro-CaCO_3 composites were prepared with POE-g-MAH and EVA-g-MAH. The crystallization and mechanical properties of the PLA/micro-CaCO_3 composites modified with different compatibilizers were compared. DSC and XRD results suggest that the addition of POE-g-MAH remarkably improve the crystallization rate and crystallinity of PLA/micro-CaCO_3 composites. When the filling content of micro-CaCO_(3 ) reach 40%, the crystallinity of PLA can be improved from 2.0% to 45.8%. While the addition of EVA-g-MAH has little effect on the crystallization of PLA/micro-CaCO_3. Mechanical tests indicate that EVA-g-MAH has better effect than POE-g-MAH on toughing the PLA/micro-CaCO_3 composites.
In order to strength the interfacial effect of PLA/micro-CaCO_3 and improve the toughness of PLA, PLA/micro-CaCO_3 composites were prepared with POE-g-MAH and EVA-g-MAH. The crystallization and mechanical properties of the PLA/micro-CaCO_3 composites modified with different compatibilizers were compared. DSC and XRD results suggest that the addition of POE-g-MAH remarkably improve the crystallization rate and crystallinity of PLA/micro-CaCO_3 composites. When the filling content of micro-CaCO_(3 ) reach 40%, the crystallinity of PLA can be improved from 2.0% to 45.8%. While the addition of EVA-g-MAH has little effect on the crystallization of PLA/micro-CaCO_3. Mechanical tests indicate that EVA-g-MAH has better effect than POE-g-MAH on toughing the PLA/micro-CaCO_3 composites.
引文
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[3] LV S,GU J,TAN H,et al.Modification of wood flour/PLA composites by reactive extrusion with maleic anhydride [J].Journal of Applied Polymer Science,2016,133 (15):43295-43304.
[4] JI D,LIU Z,LAN X,et al.Morphology,rheology,crystallization behavior,and mechanical properties of poly (lactic acid)/poly (butylene succinate)/dicumyl peroxide reactive blends [J].Journal of Applied Polymer Science,2014,131(3):39580-39588.
[5] OSTAFINSKA A,FORTELN Y I,HODAN J,et al.Strong synergistic effects in PLA/PCL blends:Impact of PLA matrix viscosity [J].Journal of the Mechanical Behavior of Biomedical Materials,2017,69:229-241.
[6] LIM S W,CHOI M C,JEONG J H,et al.Toughening poly(lactic acid) (PLA) through in situ reactive blending with liquid polybutadiene rubber (LPB) [J].Composite Interfaces,2016,23(8):807-818.
[7] KANZAWA T,TOKUMITSU K.Mechanical properties and morphological changes of poly (lactic acid)/polycarbonate/poly (butylene adipate-coterephthalate) blend through reactive processing [J].Journal of Applied Polymer Science,2011,121:2908-2918.
[8] YUAN D,CHEN K,XU C,et al.Crosslinked bicontinuous biobased PLA/NR blends via dynamic vulcanization using different curing systems [J].Carbohydrate Polymers,2014,113:438-445.
[9] 樊国栋,刘荣利.聚乳酸/无机纳米粒子复合材料研究进展 [J].科技导报,2013,31(26):68-73.FAN G D,LIU R L.Progress in the modification of poly (lactic acid) inorganic particles nanocomposites [J].Science & Technology Review,2013,31(26):68-73.
[10] SHAYAN M,AZIZI H,GHASEMI I,et al.Effect of modified starch and nanoclay particles on biodegradability and mechanical properties of cross-linked poly lactic acid [J].Carbohydrate Polymers,2015,124:237-244.
[11] KUMAR R,YAKABU M K,ANANDJIWALA R D.Effect of montmorillonite clay on flax fabric reinforced poly lactic acid composites with amphiphilic additives [J].Composites Part A:Applied Science and Manufacturing,2010,41:1620-1627.
[12] 赵楠,揣成智,王彪.PBS-g-GMA对PLA/PBS共混体系的增容性[J].高分子材料科学与工程,2011,27(11):65-68.ZHAO N,CHUAI C Z,WANG B.Compatibility of PLA/ PBS/ PBS-g-GMA blends [J].Polymer Materials Science and Technology,2011,27(11):65-68.
[13] 周凯,顾书英,邹存洋.碳酸钙填充聚乳酸复合材料的制备和性能研究[J].中国塑料,2009,23( 6):27-30.ZHOU K,GU S Y,ZOU C Y.Preparation and properties of poly (lactic acid)/CaCO3 composites [J].China Plastics,2009,23(6):27-30.
[14] KIM H S,PARK B H,CHOI J H,et al.Mechanical properties and thermal stability of poly (L-lactide) /calcium carbonate composites[J].Journal of Applied Polymer Science,2008,109:3087-3092.
[15] 全国塑料标准化技术委员会方法和产品分会.塑料拉伸性能的测定第2部分:模塑和挤塑塑料的试验条件:GB/T 1040.2-2006 [S].北京:中国标准出版社,2006.
[16] 全国塑料标准化技术委员会.塑料弯曲强度的测定:GB/T 9341-2008[S].北京:中国标准出版社,2008.
[17] 全国塑料标准化技术委员会.塑料悬臂梁冲击强度的测定:GB/T 1843-2008 [S].北京:中国标准出版社,2008.