锌离聚物原位诱导环氧橡胶动态硫化制备聚乳酸基热塑性弹性体  

Poly(lactic acid)-based thermoplastic elastomer with dynamic vulcanization of epoxidized rubber in-situ induced by a zinc ionomer

作　　者：陈宇飞[1] 耿璧垚 茹静[1] 童聪聪 张利豪 刘宏治[1,2] CHEN Yufei GENG Biyao RU Jing TONG Congcong ZHANG Lihao LIU Hongzhi(School of Engineering, Zhejiang A ＆ F University, Lin,an 311300, Zhejiang, China National Engineering and Technology Research Center of Wood-based Resources Comprehensive Utilization, Zhejiang A ＆ F University, Lin,an 311300, Zhejiang, China)

机构地区：[1]浙江农林大学工程学院,浙江临安311300 [2]浙江农林大学国家木质资源综合利用工程技术研究中心,浙江临安311300

出　　处：《浙江农林大学学报》2017年第3期528-533,共6页Journal of Zhejiang A&F University

基　　金：浙江省自然科学基金面上项目(LY15E030007);国家自然科学基金面上项目(51573169);浙江农林大学科研发展基金人才启动项目(2013FR088);浙江省大学生科技创新活动计划暨新苗人才计划项目(2016R412017);浙江省林业工程创新团队项目(101/206001000710)

摘　　要：聚乳酸(PLA)是一种原料来源于可再生资源的可生物降解聚酯材料,具有广阔的发展前景,以PLA为基体制备的动态热塑性硫化弹性体(TPV)符合可持续发展要求。为了制得新型生物基TPVs,并研究温度和EMAA-Zn用量等因素对材料力学性能及微观形态的影响,分别以PLA和聚(乙烯-丙烯酸丁酯-甲基丙烯酸环氧甘油酯)三元环氧橡胶(EBA-GMA)为塑料和橡胶相,聚(乙烯-丙烯酸)锌离聚物(EMAA-Zn)为硫化剂,通过动态硫化法制备了PLA基TPV材料。结果表明:在一定温度范围内(185~210℃),升高温度有利于ENA-GMA的交联,该体系最佳混炼温度为210℃。由力学性能数据分析得到,当PLA/EBA-GMA/EMAA-Zn三元TPV共混体系质量比为30.0∶70.0∶7.5时,样品的力学性能最佳,拉伸强度为14.2 MPa,拉断伸长率高达500%,而当EMAA-Zn质量分数较高(≥7.5%)时,样品的表面硬度逐渐变大,样品的断裂伸长率开始下降。从扫描电镜和透射电镜照片可知PLA基TPV样品呈现出TPV特有的"海-岛"相结构,即PLA为连续相,橡胶为分散相。这意味着反应后体系发生了相反转。Poly （lactic acid） （PLA）, a biodegradable polyester material which is derived from renewable re-sources and has broad development prospects, as well as thermoplastic vulcanizates （TPV） that use PLA as a matrice material, could help meet the demands of sustainable development. The objectives of this study were to prepare a novel biobased TPVs together with determine the influences of temperature and the content of a zinc ionomer of （ethylene-acrylic acid） copolymer （EMAA-Zn） on the mechanical properties as well as the mi-crostructure of the PLA-based TPVs. In this work, using a PLA as the plastic phase and an epoxidized rubber of （ethylene-butyl acrylate-glycidyl methacrylate） terpolymer （EBA-GMA） as the rubber phase along with an EMAA-Zn as a vulcanizing agent, PLA-based TPVs with different ratio of rubber and plastics were preparedusing the dynamic vulcanization method. Results revealed that in a certain temperature range （ 185 - 210 ℃ ） , increasing the temperature was conducive to the crosslinking o f ENA -GMA with the best compounding temper-ature being 210 Data from mechanical properties showed that when the P LA/EBA-GM A/EMAA-Zn ratio was 30：70：7.5, the sample had the best mechanical properties with a tensile strength of 14.2 MPa and an elongation up to 500%. However, when the content of EMAA -Zn was higher （more than 7 .5%）, surface hardness of the samples gradually increased, but the elongation at break of the samples gradually decreased. Finally , scanning electron microscope （SEM） and transmission electron microscope （TEM ） images showed that the PLA-based TPV samples exhibited the unique ＂sea-is land ＇ microstructure characteristic of TPV materials （that is the con-tinuous PLA phase and dispersed rubber phase） appeared as well. This indicates that the phase inversion has been happened.

关 键 词：聚乳酸 环氧化橡胶 离聚物 动态硫化热塑性弹性体 “海-岛”相结构 

分 类 号：TQ317[化学工程—高聚物工业]