Citation: Tian-yu Liu, Wei-jiao Jiang, Wei-xing Yang, Qin Zhang, Qiang Fu. Disentanglement of Polylactide Melt by Oscillatory Shear Stress Field[J]. Acta Polymerica Sinica, ;2018, 0(8): 1107-1115. doi: 10.11777/j.issn1000-3304.2018.18053 shu

Disentanglement of Polylactide Melt by Oscillatory Shear Stress Field

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065

Corresponding author: Qiang Fu, qiangfu@scu.edu.cn
Received Date: 9 February 2018
Revised Date: 24 March 2018
Available Online: 22 May 2018

The Haake rotational rheometer was employed to disentangle the polylactide melt by well-controlled oscillatory shear stress with sinusoidal strain and to monitor the melt viscosity in real time. Fisrtly, a PLA sample was disentangled with different strains at various frequency ranges, and the results indicated that the PLA melt represented the lowest melt viscosity which was four orders of magnitude lower than that of the PLA without any treatment when the strain was 50% with the frequency at 3.5 Hz. Then, the molecular weights of all these PLA were measured by gel permeation chromatography (GPC) and almost no change was detected after the oscillatory shear. Taken into account the results of the melt viscosity and the molecular weight measurement, it was reasonable that the significant reduction of PLA melt viscosity was attributed to the effective disentanglement of PLA chains, rather than their degradation. Furthermore, the effect of oscillatory shear on glass transition, crystallization and melting behavior was also studied. It was found that the effective disentanglement of PLA chains was achieved by oscillatory shearing, leading to a lower glass transition temperature and a cold-crystallization temperature together with largely improved crystallinity of PLA. Simultaneously, when compared to the PLA melt without any treatment, the isothermal crystallization of PLA at 120 °C with the lowest melt viscosity also demonstrated that the oscillatory shear could disentangle the PLA melt and thus accelerated the crystallization of PLA. More importantly, the influence of annealing time (1 − 30 min) and temperature (180 − 200 °C) was investigated as well. The semi-crystallization time at 120 °C of disentangled PLA constantly increased with the increasing annealing time and temperature, which got gradually closer to that of PLA without any treatment. These results demonstrated that the disentanglement could be maintained at relatively low temperature and re-entangled rapidly at relatively high temperature. In summary, the Haake rotational rheometer, the common test instrument for the rheological properties of polymer melt, can be employed for the investigation of the disentanglement of polymer melt, which is not merely a simple and effective method to disentangle the polymer melt, but also a well-controlled and real-time monitoring approach for systematically investigating the disentanglement of polymer melt.
- Oscillatory shear,
- Polylactide melt,
- Disentanglement,
- Isothermal crystallization behavior
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