含聚己内酯的聚乳酸基立构复合物的制备与性能
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摘要
将聚(右旋丙交酯-ε-己内酯)二元共聚物(PDLCA)以及聚(左旋丙交酯-ε-己内酯)二元共聚物(PLLCA)分别与聚左旋乳酸(PLLA)进行溶液共混,对PLLA进行改性,并进行对比。探讨了共聚物的添加量以及共聚物中LA/CL(LA/CL为共聚物中丙交酯与ε-己内酯的投料摩尔比)的共聚摩尔比对立构复合物的形成以及PLLA力学性能的影响。研究表明,聚己内酯(PCL)柔性链段对PLLA具有增韧效果,经过对比发现,PDLCA中的PDLA链段与PLLA之间形成的立构复合物对材料的拉伸强度具有一定的保持作用,当LA/CL为90/10,PDLCA添加量为50%时,效果最佳,材料的断裂伸长率达到30%,比PLLA的韧性提高了328%,同时,拉伸强度没有明显降低。
Poly( D-lactide)-co-poly( ε-Cl)( PDLCA)/PLLA and poly( L-lactide)-co-poly( ε-Cl)( PLLCA)/PLLA blends were prepared by solution blend method. The physical modifications on PLLA were studied. Influence of the PLCA(PLLCA and PDLCA) blending ratio and LA/CL copolymerization ratio( LA/CL was the molar ratio of LA and ε-Cl in copolymer) on the formation of PLA stereocomplex as well as the mechanical properties were studied. The results showed that the PCL had a toughening effect on PLLA. By contrast,the formation of stereocomplex between PDLA segment and PLLA had a positive effect on PLLA. Finally,when LA/CL was 90/10,the blending ratio of PDLCA was 50%,the sterecomplex-PLA was best. The elongation at break was 30%,which was 328% higher than PLLA. At the same time,the tensile strength was well maintained.
Poly( D-lactide)-co-poly( ε-Cl)( PDLCA)/PLLA and poly( L-lactide)-co-poly( ε-Cl)( PLLCA)/PLLA blends were prepared by solution blend method. The physical modifications on PLLA were studied. Influence of the PLCA(PLLCA and PDLCA) blending ratio and LA/CL copolymerization ratio( LA/CL was the molar ratio of LA and ε-Cl in copolymer) on the formation of PLA stereocomplex as well as the mechanical properties were studied. The results showed that the PCL had a toughening effect on PLLA. By contrast,the formation of stereocomplex between PDLA segment and PLLA had a positive effect on PLLA. Finally,when LA/CL was 90/10,the blending ratio of PDLCA was 50%,the sterecomplex-PLA was best. The elongation at break was 30%,which was 328% higher than PLLA. At the same time,the tensile strength was well maintained.
引文
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[15]胡君,任杰.成核剂对聚乳酸结晶改善的研究进展[J].塑料,2016,45(3):108-111.
[2] ZHANG C,WANG L,ZHAI T,et al. The surface grafting of graphene oxide with poly(ethylene glycol)as a reinforcement for poly(lactic acid)nanocomposite scaffolds for potential tissue engineering applications[J]. Journal of the Mechanical Behavior of Biomedical Materials,2016,53:403-413.
[3]高伟娜,赵雄燕,孙占英,等.聚乳酸复合材料的研究进展[J].塑料,2014,43(5):39-41.
[4]许颖,赵剑豪,杨冰,等.聚酯类生物降解塑料的降解行为[J].塑料,2014,43(4):29-33.
[5] KONWAR D. B,JACOB J,SATAPATHY B K. A comparative study of poly(L-lactide)-block-poly(ε-caprolactone)six-armed star diblock copolymers and polylactide/poly(ε-caprolactone)blends[J]. Polymer International,2016,65(9):1107-1117.
[6] PEPONI L,NAVARRO-BAENA I,BEZ J E,et al. Effect of the molecular weight on the crystallinity of PCL-b-PLLA di-block copolymers[J]. Polymer,2012,53(21):4561-4568.
[7] PENSEC S,LEROY M,AKKOUCHE H,et al. Stereocomplex formation in enantiomeric diblock and triblock copolymers of poly(ε-caprolactone)and polylactide[J]. Polymer Bulletin,2000,45(4/5):373-380.
[8] TSUJI H,IKADA Y. Blends of aliphatic polyesters. I. Physical properties and morphologies of solution-cast blends from poly(DLlactide)and poly(ε-caprolactone)[J]. Journal of Applied Polymer Science,1996,60(13):2367-2375.
[9] KANG M K,JUNG Y,KIM S H. Biodegradable stereocomplex polylactide having flexibleε-caprolactone unit[J]. Macromolecular Research,2013,21(9):1036-1041.
[10] COHN D,SALOMON H. Designing biodegradable multi-bloek PCL/PLA thermoplastic elastomers[J]. Biomaterials,2005,26(15):2297-2305.
[11] JEON B W,LEE J,KIM H S,et al. Lipase-catalyzed enantioselective synthesis of(R,R)-lactide from alkyl lactate to produce PDLA(poly D-lactic acid)and stereocomplex PLA(poly lactic acid)[J]. Journal of Biotechnology,2013,168(2):201-207.
[12] TSUJI H,HORII F,HYON S H,et al. Stereocomplex formation between enantiomeric poly(lactic acid)s. 2. Stereocomplex formation in concentrated solutions[J]. Macromolecules,1991,24(10):2719-2724.
[13]李菁,陈大凯,任杰.聚乳酸立构复合物的合成与表征[J].塑料,2011,40(3):73-75.
[14] LV T,ZHOU C,LI J,et al. New insight into the mechanism of enhanced crystallization of PLA in PLLA/PDLA mixture[J]. Journal of Applied Polymer Science,2018,135(2):45663.
[15]胡君,任杰.成核剂对聚乳酸结晶改善的研究进展[J].塑料,2016,45(3):108-111.