Joncryl Chain Extender Reactivity with Polylactide: Effect of PLA Molecular Weight and the Resultant Rheological and Crystallization Behaviors
JOURNAL OF POLYMERS AND THE ENVIRONMENT, cilt.34, sa.1, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 34 Sayı: 1
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s10924-025-03753-8
- Dergi Adı: JOURNAL OF POLYMERS AND THE ENVIRONMENT
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, BIOSIS, Chemical Abstracts Core, Chimica, Compendex, Environment Index, Geobase, Greenfile, Natural Science Collection (ProQuest), Biomedical Reference Collection: Corporate Edition (EBSCO), Earth, Atmospheric, & Aquatic Science Collection (ProQuest), Materials Science & Engineering Collection (ProQuest), Pharma Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: Differential scanning calorimetry, Joncryl, Molecular weight, Polylactide, Rheology
- İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet
Özet
This study investigates the effect of polylactide (PLA) molecular weight on the reactivity of multifunctional epoxy-based chain extender, Joncryl. PLA samples with low (L-PLA), medium (M-PLA), and high (H-PLA) molecular weights, each with D-lactic acid contents below 1.5 mol%, were melt-processed with 0.5 and 1.0 wt% Joncryl ADR 4468. The melt rheological behavior, molecular weight, and crystallization kinetics of the processed samples were evaluated using a rheometer, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC), respectively. Small-amplitude oscillatory shear rheology and GPC analyses showed that Joncryl reactions with higher molecular weight PLA resulted in more dramatic enhancements. This enhanced long-chain branching in turn provided stronger improvements to the melt rheological properties and to final molecular weight. Non-isothermal DSC analysis demonstrated that Joncryl modification suppressed crystallization more noticeably in high-molecular weight PLAs. Isothermal DSC analysis further revealed that long-chain branching nearly doubled the crystallization time while significantly reducing the final crystallinity.