退火时间及温度对HDPE薄膜结构与性能的影响
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摘要
通过热压成型技术制备了高密度聚乙烯(HDPE)薄膜,研究了退火温度和退火时间对HDPE薄膜结构和性能的影响;通过差示扫描量热分析(DSC)、二维广角X射线衍射(2D-WAXD)和拉伸性能测试,对退火前后样品的结构和性能进行了表征。结果表明:退火温度和退火时间分别为110℃和3 h时,制品的性能最佳,与未退火制品相比,其拉伸强度和弹性模量分别提高了50.4%和35.6%;退火后,制品的结晶度提高,分子链取向程度增大。
High density polyethylene(HDPE) films were prepared by hot pressing. The effects of annealing temperature and time on the structure and properties of HDPE films were studied. The structure and properties of the samples before and after annealing were characterized by differential scanning calorimetry(DSC), two-dimensional wide-angle X-ray diffraction(2D-WAXD) and tensile test. The results show that when annealing temperature and annealing time are 110℃ and 3 h respectively, the properties of the products are the best. Compared with the unannealed products, the tensile strength and elastic modulus of the products are increased by 50.4% and 35.6% respectively. After annealing, the crystallinity and molecular chain orientation of the products are improved.
High density polyethylene(HDPE) films were prepared by hot pressing. The effects of annealing temperature and time on the structure and properties of HDPE films were studied. The structure and properties of the samples before and after annealing were characterized by differential scanning calorimetry(DSC), two-dimensional wide-angle X-ray diffraction(2D-WAXD) and tensile test. The results show that when annealing temperature and annealing time are 110℃ and 3 h respectively, the properties of the products are the best. Compared with the unannealed products, the tensile strength and elastic modulus of the products are increased by 50.4% and 35.6% respectively. After annealing, the crystallinity and molecular chain orientation of the products are improved.
引文
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[12]石素宇,王利娜,许文仲,等.微注射成型HDPE制品的结构和力学性能[J].郑州大学学报:工学版,2016,37(6):24-27,33.
[13]Shi S Y,Wang L N,Xin C Z,et al.Special morphology and its role in mechanical enhancement of LLDPE/MWCNTs composites prepared by hot compression molding[J].J Appl Polym Sci,2017,134:45 525-45 532.
[14]Wang K.Crystallization behavior and mechanical properties of PP/EVA blends[J].Adv Mater Res,2014,1033-1034:869-872.
[2]肖亚航,傅敏士.木粉/ABS复合材料的热压成型工艺研究[J].塑料工业,2004(12):58-60.
[3]张晨夕.苘麻纤维/PE复合材料热压成型及性能研究[D].哈尔滨:东北林业大学,2012.
[4]张东辉.木质纤维/PP复合材料模压成型工艺及其性能研究[D].南京:南京农业大学,2009.
[5]Samon J M,Schultz J M,Hsiao B S,et al.Structure development during melt spinning and subsequent annealing of polybutene-1 fiber[J].J Polym Sci,Part B:Polym Phys,2000,38(14):1 872-1 882.
[6]Na B,Li Z J,Lv R H,et al.Annealing-induced structural rearrangement and its toughening effect in injection-molded isotactic polypropylene[J].Polym Eng Sci,2012,52(4):893-900.
[7]Shi S Y,Pan Y M,Lu B,et al.Realizing the simultaneously improved toughness and strength of ultra-thin LLDPE parts through annealing[J].Polymer,2013,54(25):6 843-6 852.
[8]Bai H W,Deng H,Zhang Q,et al.Effect of annealing on the microstructure and mechanical properties of polypropylene with oriented shish-kebab structure[J].Polym Int,2012,61(2):252-258.
[9]Bai H W,Wang Y,Zhang Z J,et al.Influence of annealing on microstructure and mechanical properties of isotactic polypropylene withβ-phase nucleating agent[J].Macromolecules,2009,42(17):6 647-6 655.
[10]左彪,何婷婷,李俊燕,等.聚合物薄膜玻璃化转变及其分子松弛行为的研究进展[J].中国科学,2015,45(2):139-157.
[11]潘亚敏,石素宇,常宝宝,等.退火对等规聚丙烯微注射制品性能及结构的影响[J].郑州大学学报:工学版,2013,34(6):59-62.
[12]石素宇,王利娜,许文仲,等.微注射成型HDPE制品的结构和力学性能[J].郑州大学学报:工学版,2016,37(6):24-27,33.
[13]Shi S Y,Wang L N,Xin C Z,et al.Special morphology and its role in mechanical enhancement of LLDPE/MWCNTs composites prepared by hot compression molding[J].J Appl Polym Sci,2017,134:45 525-45 532.
[14]Wang K.Crystallization behavior and mechanical properties of PP/EVA blends[J].Adv Mater Res,2014,1033-1034:869-872.