Introducing four different branch structures in PET by reactive processing––A rheological investigation,Journal of Applied Polymer Science

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Introducing four different branch structures in PET by reactive processing––A rheological investigation
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-03-25 , DOI: 10.1002/app.49243
Hossein Arayesh ₁ , Nadereh Golshan Ebrahimi ₁ , Behnam Khaledi ₁ , Masood Khabazian Esfahani ₁

Affiliation

Chain extension/branching by reactive processing is a well‐known method to enhance the rheological properties of polymers. In this study, pyromellitic dianhydride, poly(glycolic acid), triglycidyl isocyanurate, and bisphenol A diglycidyl ether were used as chain extender/branching agents to produce branched Polyethylene terephthalate (PETs) with four different molecular structures. According to the linear rheological characterizations, the storage modulus and complex viscosity of modified PET samples enhanced significantly after branching. The shear viscosities of modified PET show a pronounced shear‐thinning behavior and a remarkable increase at low frequencies, which can be an indication of the existence of long‐chain branches (LCBs) in the molecular structure of polymer and broadening the molecular weight distribution. Fourier transform infrared (FTIR) and differential scanning calorimetry (DSC) analysis were used to investigate the effect of branching agents on the chemical structure and thermal properties of PET, respectively. DSC results show that higher amounts of LCBs lead to lower melting and crystallization temperatures.

中文翻译：

通过反应加工在PET中引入四种不同的分支结构–流变学研究

反应性加工的扩链/支化是提高聚合物流变性能的众所周知的方法。在这项研究中，均苯四甲酸二酐，聚乙醇酸，三缩水甘油基异氰脲酸酯和双酚A二缩水甘油醚用作扩链剂/支链剂，以生产具有四个不同分子结构的支链聚对苯二甲酸乙二醇酯（PET）。根据线性流变学特征，改性PET样品的支化后储能模量和复数粘度显着提高。改性PET的剪切粘度表现出显着的剪切稀化行为，并且在低频下具有显着的增加，这可能表明聚合物分子结构中存在长链分支（LCB）并加宽了分子量分布。利用傅里叶变换红外（FTIR）和差示扫描量热法（DSC）分析分别研究了支化剂对PET的化学结构和热性能的影响。DSC结果表明，较高含量的LCB会导致较低的熔融和结晶温度。

更新日期：2020-03-25

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