Rheological properties and crystallization behavior of modified polylactic acid using lauroyl peroxide and glycidyl methacrylate,Journal of Applied Polymer Science

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Rheological properties and crystallization behavior of modified polylactic acid using lauroyl peroxide and glycidyl methacrylate
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-18 , DOI: 10.1002/app.49924
Mona Jafari ₁ , Nadia Jalalifar ₂ , Babak Kaffashi ₁

Affiliation

The molecular structure of polylactic acid (PLA) was modified by lauroyl peroxide (LP) as an alkyl free radical and glycidyl methacrylate (GMA) as a reactive co‐monomer. We investigated the effect of different preparation methods, that is, the melt and solution, on the structure and physical and mechanical properties of glycidyl methacrylate grafted polylactic acid (PLA‐g‐GMA). The Fourier transformed infrared spectroscopy (FTIR) was implemented to characterize the final products in order to confirm that GMA was successfully grafted onto PLA. The gel permeation chromatography showed that the molecular weight and polydispersity of the modified PLA were increased by grafting. However, by varying other parameters such as the reaction time and the LP and GMA concentrations, we observed that the resulting products from the melt method are richer in the rheological properties compared with those properties from the solution method. This is due to the different molecular weights resulted from the either preparation methods. From the DSC characteristics of PLA‐g‐GMA samples, the crystallization degree of the samples prepared from the melt method is greater than that of the solution method. Meanwhile, the cold crystallization for the PLA‐g‐GMA samples derived from the solution method occurs at higher temperatures compared with the cold crystallization of the samples resulted from the melt method.

中文翻译：

月桂酰过氧化物和甲基丙烯酸缩水甘油酯改性聚乳酸的流变性质和结晶行为

聚乳酸（PLA）的分子结构被月桂酰过氧化物（LP）修饰为烷基自由基，甲基丙烯酸缩水甘油酯（GMA）修饰为反应性共聚单体。我们研究了不同的制备方法（即熔融和固溶）对甲基丙烯酸缩水甘油酯接枝聚乳酸（PLA-g-GMA）的结构和物理机械性能的影响。实施傅立叶变换红外光谱（FTIR）表征最终产品，以确认GMA已成功嫁接到PLA上。凝胶渗透色谱表明，通过接枝可以提高改性PLA的分子量和多分散性。但是，通过更改其他参数（例如反应时间以及LP和GMA浓度），我们观察到，与溶液法相比，熔融法制得的产品具有更高的流变性。这是由于两种制备方法产生的分子量不同。从PLA‐g‐GMA样品的DSC特性来看，采用熔融法制备的样品的结晶度要大于溶液法的结晶度。同时，与通过熔融法得到的样品的冷结晶相比，从固溶法得到的PLA-g-GMA样品的冷结晶在更高的温度下发生。由熔融法制备的样品的结晶度大于溶液法的结晶度。同时，与通过熔融法得到的样品的冷结晶相比，从固溶法得到的PLA-g-GMA样品的冷结晶在更高的温度下发生。由熔融法制备的样品的结晶度大于溶液法的结晶度。同时，与通过熔融法得到的样品的冷结晶相比，从固溶法得到的PLA-g-GMA样品的冷结晶在更高的温度下发生。

更新日期：2020-11-25

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