| 用于生物降解膜的聚己内酯与聚乳酸共混物制备及性能分析 |
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| 引用本文： | 李新功,纪雨辛,唐钱,朱凌波.用于生物降解膜的聚己内酯与聚乳酸共混物制备及性能分析[J].农业工程学报,2016,32(15):182-186. |
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| 作者姓名： | 李新功 纪雨辛 唐钱 朱凌波 |
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| 作者单位： | 中南林业科技大学材料科学与工程学院,长沙,410004 |
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| 基金项目： | 湖南省自然科学省市联合基金项目(14JJ5017)；湖南省高校创新平台开放基金项目(13K071) |
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| 摘 要： | 聚乳酸农用薄膜在自然条件下能够降解为CO2和H2O,可以有效地避免传统农用薄膜废弃后造成的土壤和环境污染。将聚己内酯与聚乳酸共混可以改善聚乳酸脆性强和韧性差的特点。该文将不同质量比例的聚己内酯(polycaprolactone,PCL)和聚乳酸(polylactic acid,PLA)熔融共混后通过注射成型工艺制备了农业薄膜用PCL/PLA共混物,研究了PCL与PLA配比对共混物力学性能、热稳定性、结晶熔融行为以及表面润湿性的影响。结果表明:随着PCL含量增加,共混物的拉伸强度逐渐下降,而拉伸断裂伸长率和冲击强度则先增大后减小。PCL质量分数为50%时,共混物拉伸断裂伸长率和冲击强度分别达到最大值11.2%和6.4 KJ/m2;扫描电镜分析显示,PCL与PLA相容差,聚酯连续相种类及优势共同主导力学性能走向;热重分析表明,PCL的引入有效减缓了共混物热解速率,PLA质量分数增加共混物燃烧成炭率增大;差示扫描量热法分析表明,相对于PCL和PLA,PCL/PLA共混物玻璃化转化温度、熔融温度和结晶温度均产生了变化,但二者配料比对3种温度影响不明显;接触角分析表明,PCL/PLA共混物接触角相比于PCL和PLA均有所增大,水润湿性能不同程度的降低。综合考虑,PCL与PLA最佳质量比为50∶50。研究可为农业薄膜用聚己内酯与聚乳酸共混物的制备提供依据。
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| 关 键 词： | 聚己内酯 混炼 扫描电镜 聚乳酸 注射成型 共混特性 |
| 收稿时间： | 1/2/2016 12:00:00 AM |
| 修稿时间： | 2016/5/10 0:00:00 |
Preparation and properties analysis of polycaprolactone/polylactic acid blend for agricultural biodegradable film |
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| Li Xingong,Ji Yuxin,Tang Qian and Zhu Lingbo.Preparation and properties analysis of polycaprolactone/polylactic acid blend for agricultural biodegradable film[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(15):182-186. |
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| Authors: | Li Xingong Ji Yuxin Tang Qian and Zhu Lingbo |
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| Institution: | College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China,College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China,College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China and College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China |
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| Abstract: | Poly lactic acid (PLA) is a kind of environment-friendly high polymer material with the characteristics of biodegradability and good processability, which can be used in producing agricultural film.However, the PLA perform brittleness leads to several defects of PLA film, which might be overcome by addition of polycaprolactone (PCL).This study aimed to find the optimal PCL and PLA ratio for PCL/PLA blend preparation.The preparation and performance tests in the study were all completed in the key laboratory of bio-composite materials of College of Materials Science and Engineering in Central South University of Forestry and Technology in Changsha, Hunan.PCL and PLA mass ratio including 0:100, 30:70, 40:60, 50:50, 60:40, and 100:0 was designed.The PCL/PLA blend was prepared through melt blending and injection molding process.Measured indicators included mechanical properties such as tensile strength, tensile elongation at break and the impact strength.Meanwhile, the micro interface bonding, thermal stability, melting and crystallization behavior as well as the surface wetability of the PCL/PLA blend were tested and analyzed.The analysis of mechanical property tests showed that, with the increase of PCL mass fraction, the tensile strength of PCL/PLA blend decreased gradually, while the tensile elongation at break and impact strength increased first and then decreased.The blend tensile elongation at break and impact strength reached the maximum value of 11.2% and 6.3 MPa, respectively when the PCL mass fraction was 50%.Scanning electron microscopy analysis showed a poor micro interface bond, indicating an inferior compatibility between PLA and PCL.Moreover, it was found that the mechanical properties of PCL/PLA blend were influenced by both the kind and characteristics of the continuous phase of polyester.Thus the results that tensile fracture of blend with the 50% PCL presented the best bonding situation of the 2 continue phases were consistent with results of the mechanical property test.Thermogravimetry analysis showed that the PCL effectively reduced the pyrolysis rate of the blend, improved the pyrolysis temperature and the carbon content of blend increased with the increase of mass fraction of PLA.Differential scanning calorimeter analysis showed that, compared to PLA and PCL, PLA/PCL blend glass transition temperature, melting temperature and crystallization temperature had changed, but effect of the mass ratio on 3 kinds of temperature was not obvious.While the contact angle analysis showed that the contact angles of PCL/PLA blend increased compared to PCL and PLA, reducing the water wettability.When the mass ratio of PCL and PLA was 50:50, the contact angle of PCL/PLA blend was highest (96.2°).In a comprehensive consideration, PCL/PLA blend performed the best properties with the PCL and PLA mass ratio of 50:50, and in the other words, the PCL modified the toughness of the composites effectively.The study could provide valuable information for biodegradable plastic film preparation. |
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| Keywords: | polycaprolactone blending scanning electron microscopy polylactic acid injection molding blending characteristics |
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