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首页> 外文期刊>Journal of Polymers and the Environment >Preparation Characterization of Modified Poly(Lactic Acid) Using Dicumyl Peroxide and Tetraglycidyl Diamino Diphenyl Methane
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Preparation Characterization of Modified Poly(Lactic Acid) Using Dicumyl Peroxide and Tetraglycidyl Diamino Diphenyl Methane

机译：用二磺酰基二苯基二苯基甲烷制备改性聚（乳酸）的制备表征

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摘要

Poly(lactic acid) (PLA) was modified using dicumyl peroxide (DCP) and tetraglycidyl diamino diphenyl methane (TGDDM) to improve its melt viscosity and molecular weight for a variety of industrial applications. The PLA was branched or crosslinked with DCP at 180 degrees C, and gel content was detected as the DCP concentration was over 0.6 phr. However, for TGDDM, it was observed that only chain extension or branching occurred; the number- and weight-average molecular weights and polydispersity index (PDI) increased. The melt flow index decreased as the concentration levels of DCP and TGDDM increased. However, when the TGDDM was over 0.5 phr, the opposite results were observed. The variations in the mechanical properties of modified PLA were marginal; however, the elongation at break slightly decreased. The onset value of the decomposition temperature of the DCP-modified PLA slightly decreased. In contrast, with TGDDM, the onset value slightly increased. As the branching and crosslinking of the modified PLA increasingly occurred, relatively low relaxation enthalpy was detected. However, the glass transition temperature (T-g) was not influenced. An increase in the storage modulus (G '), loss modulus (G ''), and complex viscosity (eta*), and a decrease in tan delta at low frequencies showed that the rheological behavior of the modified PLA turned from liquid-like to solid-like because of the modifications achieved using DCP and TGDDM.
机译：使用二甲基过氧化二琥珀酰（DCP）和四丙氨酸氨基甲酸二苯基甲烷（TGDDM）改性聚（乳酸）（PLA），以改善其各种工业应用的熔体粘度和分子量。将PLA用DCP支化或与180℃的DCP交联，并且检测凝胶含量，因为DCP浓度超过0.6phr。然而，对于TGDM，观察到只发生链延伸或分支;数量和重量平均分子量和多分散性指数（PDI）增加。随着DCP和TGDDM的浓度水平增加，熔体流量指数降低。然而，当TGDDM超过0.5phr时，观察到相反的结果。改性PLA的机械性能的变化是边缘的;然而，断裂处的伸长率略微下降。 DCP改性PLA分解温度的起始值略微降低。相比之下，具有TGDM，发病值略微增加。随着改性PLA越来越多地发生的分支和交联，检测到相对低的松弛焓。但是，玻璃化转变温度（T-G）没有受影响。储存模量（G'），损耗模量（G''）和复杂粘度（ETA *）的增加，并且在低频下的TAN DELTA的减少表明，改性PLA的流变行为从液体转动由于使用DCP和TGDDM实现的修改，因此依赖于固态。

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