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<p>Properties of biodegradable PLA is highly affected by chain branching of the polymer. In this work modified PLAs were prepared via free radical reaction method in presence of dicumyl peroxide (DCP) as radical initiator using internal mixer and long chain branched (LCB) PLA with various characteristics were obtained. Triallyl isocyanurate (TAIC) was added to the mixer as a co-agent and the role of TIAC on properties was studied. Molecular structure of the PLA samples was investigated by gel permeation chromatography (GPC) and rheometry on shear and extensional mode. To determine the gel content of the samples, it can be said that the crosslinking not happened in any of the modified samples. Formation of Long chain branched PLA was confirmed by appeared shoulder at high molecular weights and increase in the zero shear viscosity, complex viscosity, storage modulus and strain hardening under elongational flow. The results showed that the LCB of PLA created at a very low content of either DCP or TAIC.&#xa0;</p>

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Relation between structure and rheological behavior of long chain branching Poly(lactic acid)

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Zahra Kordkatooli,
  • Mohammad Karrabi,
  • Hamed Azizi,
  • Ismaeil Ghasemi,
  • Saeid Ahmadjo

摘要

Properties of biodegradable PLA is highly affected by chain branching of the polymer. In this work modified PLAs were prepared via free radical reaction method in presence of dicumyl peroxide (DCP) as radical initiator using internal mixer and long chain branched (LCB) PLA with various characteristics were obtained. Triallyl isocyanurate (TAIC) was added to the mixer as a co-agent and the role of TIAC on properties was studied. Molecular structure of the PLA samples was investigated by gel permeation chromatography (GPC) and rheometry on shear and extensional mode. To determine the gel content of the samples, it can be said that the crosslinking not happened in any of the modified samples. Formation of Long chain branched PLA was confirmed by appeared shoulder at high molecular weights and increase in the zero shear viscosity, complex viscosity, storage modulus and strain hardening under elongational flow. The results showed that the LCB of PLA created at a very low content of either DCP or TAIC.