Molar mass and temperature dependence of rheological properties of polymethylmethacrylate melt

Lu, Zhili; Pan, Yamin; Liu, Xianhu; Zheng, Guoqiang; Schubert, Dirk W.; Liu, Chuntai

doi:10.1016/j.matlet.2018.03.077

Cited by 23 publications

(12 citation statements)

References 14 publications

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“…In order to assess the significance of hydrolysis in the molten state, time sweep tests at constant frequency were performed [ 34 , 35 ]. The rheological tests were carried out by a Haake Mars II (Thermo scientific, Waltham, MA, USA) rotational rheometer in dynamic mode in a parallel plate configuration under nitrogen atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Poly(Lactic Acid)-Based Nanobiocomposites with Modulated Degradation Rates

et al. 2018

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In the field of biodegradable polymers such as poly(Lactic Acid) (PLA), it is quite well known that their kinetics of hydrolysis strongly depend on the pH of the hydrolyzing medium. The idea explored during this study focused on PLA, is the addition of additives that are able to control the pH of water when it diffuses inside the polymer. For instance, acids (i.e. succinic acid, also used as food additive) are bio- and eco- friendly additives that are able to play this role. In order to control the release of these molecules and their dispersion inside the polymer, their intercalation in biocompatible nanofillers like layered double hydroxides (LDH) is here considered. The additives have been dispersed in the polymer by melt compounding, commonly used in the plastic industry. Several composites of PLA (4032D) and LDH intercalated with organic acids (succinic, fumaric, and ascorbic acid) have been obtained by an extrusion process. From all extruded materials, PLA films obtained by compression molding were then subjected to hydrolysis tests. The results showed that the mentioned molecules, dispersed in the polymer, are able to control the rate of hydrolysis, and experimental results show an increase of degradation time for samples containing LDH-organic acid (in particular with LDH-succinic acid), making such hybrid additives an appropriate and efficient solution for PLA.

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Section: Methodsmentioning

confidence: 99%

Poly(Lactic Acid)-Based Nanobiocomposites with Modulated Degradation Rates

et al. 2018

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“…On the other hand, from figure 3, it was found that there is a shoulder peak (see the arrows) for F600 samples, which does not appear in 5000S indicating that the high-molecular weight is one of the important reasons for this phenomenon. F600 has a high viscosity, which is proportional to the molecular weight [18][19][20][21]. Thus, F600 is more viscous than 5000S.…”

Section: Resultsmentioning

confidence: 99%

Large-scale formation of shish-kebab in water-assisted injection-moulded high-density polyethylene with a high-molecular weight

2019

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To promote flow-induced orientation and reserve the formation of the shish-kebab structure, a modified injectionmoulding technology named water-assisted injection moulding (WAIM), was applied to provide twice the shear flow and a rapid cooling rate on high-molecular weight high-density polyethylene (HDPE) melt in a mould cavity. Large-scale distribution of highly oriented shish-kebab was successfully achieved in a WAIM sample with a high-molecular weight. More importantly, the high-orientation degree of lamellae (larger than 0.4) in the thickness direction for a high-molecular weight WAIM sample is >60%, which is much more than a conventional injection-moulded sample (15%). This work provides a new insight to achieve injection-moulded products with enhanced oriented structures.

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“…Additionally, the morphological and structural evolutions of WAIM–molded polyolefin parts in the presence of NAs as well as fillers are still unclear. Especially, the mutifunctions are desired to satisfy various applications including sensing, structural materials, energy, electromagnetic interference (EMI) shielding, environmental remediation, etc . Therefore, additional efforts have to be made to further investigate and improve the WAIM technology for producing various nanocomposite parts.…”

Section: Discussionmentioning

confidence: 99%

Overview of the Experimental Trends in Water‐Assisted Injection Molding

Liu

Pan

Zheng

et al. 2018

Macro Materials & Eng

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In recent years, a new and promising polymer processing technology known as water‐assisted injection molding (WAIM) has attracted attention not only for academic reasons but also for its industrial applications. WAIM technology provides a new way to fabricate hollow or other complicated products due to its faster cycling time and light weight. This paper aims to give an overview of the basic principles and applications of WAIM as well as the current research status in academia. The origin and development of WAIM technology are first described and then, their advantages and applications are given. This review focuses on the experimental trends of WAIM such as computer simulation, the effect of processing parameters on the WAIM samples, and the morphology as well as related WAIM–molded composites and polymer blends' work.

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Molar mass and temperature dependence of rheological properties of polymethylmethacrylate melt

Cited by 23 publications

References 14 publications

Poly(Lactic Acid)-Based Nanobiocomposites with Modulated Degradation Rates

Poly(Lactic Acid)-Based Nanobiocomposites with Modulated Degradation Rates

Large-scale formation of shish-kebab in water-assisted injection-moulded high-density polyethylene with a high-molecular weight

Overview of the Experimental Trends in Water‐Assisted Injection Molding

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