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首页> 外文期刊>Journal of Polymers and the Environment >Blending Modification of PHBV/PCL and its Biodegradation by Pseudomonas mendocina
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Blending Modification of PHBV/PCL and its Biodegradation by Pseudomonas mendocina

机译：PHBV / PCL的共混修饰及其Mendocina假单胞菌的生物降解

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摘要

Poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV) is a biodegradable polymer synthesized in microorganisms. The application of PHBV is limited by certain material disadvantages. Poly(e-caprolactone) (PCL) possesses excellent thermodynamic and mechanical properties and was used to modify PHBV in the presence of triethyl citrate (TEC) and dicumyl peroxide (DCP), which was used as plasticizer and grafting agent, respectively. The effects of PCL and additive agents on the mechanical, thermal, amphipathic and degradability behaviors of the blends were investigated. The results showed that the mechanical properties of the PHBV blends improved by PCL incorporation and improved even further after TEC and DCP addition. The addition of DCP could not induce an increase in crystallization temperature but improved the crystallization degree of the blends. The presence of hydrophilic groups in TEC leads to an apparent increases in the hydrophilicity of the PHBV blends. A PHBV/PCL blend (40/60) with TEC (20 wt.%) and DCP (0.5 wt.%) was chosen for its good mechanical properties and hydrophilicity. The chosen ratio of the blends was also shown a preferable degradation activity by biodegradation assay using Pseudomonas mendocina. The addition of TEC and DCP has no conspicuous negative effect on the biodegradation.
机译：聚（3-羟基丁酸酯-共羟基戊酸酯）（PHBV）是在微生物中合成的可生物降解的聚合物。 PHBV的应用受到某些材料缺点的限制。聚己内酯（PCL）具有出色的热力学和机械性能，可在柠檬酸三乙酯（TEC）和过氧化二枯基（DCP）分别用于增塑剂和接枝剂的条件下，对PHBV进行改性。研究了PCL和添加剂对共混物的机械，热，两亲和降解行为的影响。结果表明，PHBV共混物的机械性能通过加入PCL得以改善，并且在加入TEC和DCP后甚至进一步改善。 DCP的添加不能引起结晶温度的升高，但是改善了共混物的结晶度。 TEC中亲水基团的存在导致PHBV共混物的亲水性明显增加。选择具有TEC（20 wt。％）和DCP（0.5 wt。％）的PHBV / PCL共混物（40/60），因为它具有良好的机械性能和亲水性。通过使用门氏假单胞菌的生物降解测定法，所选择的共混物比例也显示出优选的降解活性。 TEC和DCP的添加对生物降解没有明显的负面影响。

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