Base-Catalyzed Hydrolysis Behavior of PLA/PBS Blends

2013 ◽  
Vol 821-822 ◽  
pp. 941-944
Author(s):  
Shi Jie Zhang ◽  
Yi Wen Tang ◽  
Li Hua Cheng
Keyword(s):  
Molecular Weight ◽  
Lactic Acid ◽  
Degradation Rate ◽  
Degradation Process ◽  
Poly Lactic Acid ◽  
Biodegradable Materials ◽  
Butylene Succinate ◽  
New Type

Poly (butylene succinate) (PBS) was mixed with Poly (lactic acid) (PLA) through Haake Reomix, a new type of biodegradable materials can be obtained. With the increasing addition of PBS and the raise of the solution basicity, the degradation rate of blends increase sharply. The GPC analysis can approve the reduction of molecular weight in the degradation process of PLA/PBS blends.

Biodegradation Behavior of PLA/PBS Blends

2013 ◽  
Vol 821-822 ◽  
pp. 937-940 ◽  
Author(s):  
Shi Jie Zhang ◽  
Yi Wen Tang ◽  
Li Hua Cheng
Keyword(s):  
Molecular Weight ◽  
Weight Loss ◽  
Lactic Acid ◽  
Average Molecular Weight ◽  
Poly Lactic Acid ◽  
Degradation Behavior ◽  
Butylene Succinate ◽  
Exponential Decrease ◽  
Degradation Time

Poly (butylene succinate) (PBS) was mixed with Poly (lactic acid) (PLA) in the melt state. The PLA/PBS blends with different constitution were produced. The samples were buried in laterite. Samples were dug out of soil after the burial for 10, 20, 30, 40, 50 and 60 days, respectively. The weight loss and molecular weight of the sample were tested. The analysis showed that the nearly exponential decrease in average molecular weight as a function of degradation time. The PLA and PBS have the similar degradation behavior in the soil.

Physical and Mechanical Properties of Poly(Butylene Succinate) and Poly(Lactic Acid) under Landfill Conditions

2020 ◽  
Vol 856 ◽  
pp. 245-252
Author(s):  
Narumon Seeponkai ◽  
Krisana Poolsawat
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Physical And Mechanical Properties ◽  
Degradation Process ◽  
Chain Scission ◽  
Poly Lactic Acid ◽  
Ester Bond ◽  
Butylene Succinate ◽  
Erosion Mechanism ◽  
Scanning Electron

In this study, the disintegration of poly(butylene succinate)(PBS) and poly(lactic acid) (PLA) under landfill conditions was investigated. Both polymers were melted, injected into a dumbbell-shape, and buried under the soil for 20 weeks. The morphology of the polymer from the scanning electron microscope (SEM) revealed that, after 6 weeks of the burial, the PBS polymer produced many micro-voids in the bulk of polymer. The amount of the voids increased with time. While the morphology of PLA showed a few voids and some cracks during the degradation process. Moreover, the mechanical properties of the PLA were decreased after 2 weeks following with PBS after 4 weeks of the burial times. The weight loss and the water uptake of PBS and PLA were slightly increased. From the result, it was found that the degradation of PBS and PLA proceeds via random chain scission of the ester bond through bulk erosion mechanism. The degradation of PLA degraded faster than the PBS due to the low crystallinity in the polymer chain. This result can be applied to the design waste management of biodegradable polymer products.

scholarly journals Poly(lactic Acid): A Versatile Biobased Polymer for the Future with Multifunctional Properties—From Monomer Synthesis, Polymerization Techniques and Molecular Weight Increase to PLA Applications

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1822
Author(s):  
Evangelia Balla ◽  
Vasileios Daniilidis ◽  
Georgia Karlioti ◽  
Theocharis Kalamas ◽  
Myrika Stefanidou ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Lactic Acid ◽  
Chain Extension ◽  
Poly Lactic Acid ◽  
Plastic Pollution ◽  
Practical Applications ◽  
Decomposition Reactions ◽  
Melt Polycondensation ◽  
Polymerization Conditions ◽  
Molecular Weight Increase

Environmental problems, such as global warming and plastic pollution have forced researchers to investigate alternatives for conventional plastics. Poly(lactic acid) (PLA), one of the well-known eco-friendly biodegradables and biobased polyesters, has been studied extensively and is considered to be a promising substitute to petroleum-based polymers. This review gives an inclusive overview of the current research of lactic acid and lactide dimer techniques along with the production of PLA from its monomers. Melt polycondensation as well as ring opening polymerization techniques are discussed, and the effect of various catalysts and polymerization conditions is thoroughly presented. Reaction mechanisms are also reviewed. However, due to the competitive decomposition reactions, in the most cases low or medium molecular weight (MW) of PLA, not exceeding 20,000–50,000 g/mol, are prepared. For this reason, additional procedures such as solid state polycondensation (SSP) and chain extension (CE) reaching MW ranging from 80,000 up to 250,000 g/mol are extensively investigated here. Lastly, numerous practical applications of PLA in various fields of industry, technical challenges and limitations of PLA use as well as its future perspectives are also reported in this review.

scholarly journals Poly(Lactic Acid)–Poly(Butylene Succinate)–Sugar Beet Pulp Composites; Part I: Mechanics of Composites with Fine and Coarse Sugar Beet Pulp Particles

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2531
Author(s):  
Rodion Kopitzky
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Sugar Beet ◽  
Cell Structure ◽  
Sugar Beet Pulp ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Fracture Patterns ◽  
Beet Pulp ◽  
The Impact

Sugar beet pulp (SBP) is a residue available in large quantities from the sugar industry, and can serve as a cost-effective bio-based and biodegradable filler for fully bio-based compounds based on bio-based polyesters. The heterogeneous cell structure of sugar beet suggests that the processing of SBP can affect the properties of the composite. An “Ultra-Rotor” type air turbulence mill was used to produce SBP particles of different sizes. These particles were processed in a twin-screw extruder with poly(lactic acid) (PLA) and poly(butylene succinate) (PBS) and fillers to granules for possible marketable formulations. Different screw designs, compatibilizers and the use of glycerol as a thermoplasticization agent for SBP were also tested. The spherical, cubic, or ellipsoidal-like shaped particles of SBP are not suitable for usage as a fiber-like reinforcement. In addition, the fineness of ground SBP affects the mechanical properties because (i) a high proportion of polar surfaces leads to poor compatibility, and (ii) due to the inner structure of the particulate matter, the strength of the composite is limited to the cohesive strength of compressed sugar-cell compartments of the SBP. The compatibilization of the polymer–matrix–particle interface can be achieved by using compatibilizers of different types. Scanning electron microscopy (SEM) fracture patterns show that the compatibilization can lead to both well-bonded particles and cohesive fracture patterns in the matrix. Nevertheless, the mechanical properties are limited by the impact and elongation behavior. Therefore, the applications of SBP-based composites must be well considered.

scholarly journals An investigation on the degradation behaviors of Mg wires/PLA composite for bone fixation implants: influence of wire content and load mode

2021 ◽  
Vol 28 (1) ◽  
pp. 39-47
Author(s):  
Xuan Li ◽  
Yu Cong ◽  
Jisheng Sui ◽  
Xiaolong Li
Keyword(s):  
Lactic Acid ◽  
Dynamic Load ◽  
Degradation Rate ◽  
Convective Transport ◽  
Poly Lactic Acid ◽  
Mechanical Loss ◽  
Bone Fixation ◽  
Load Mode ◽  
Degradation Behaviors ◽  
Ph Decrease

Abstract Poly-lactic acid based biocomposite strengthened with magnesium alloy wires (Mg wires/PLA composite) is prepared for bone fixation implantation. The influence of wire content and load mode on the degradation performances of the composite and its components is studied. The result suggests the degradation of Mg wires could slow down the pH decrease originated from the degradation of PLA, while a relatively high wire content contributes to descend the degradation rate of Mg wire in the composite. Dynamic load significantly promotes the mechanical loss of the specimens. After 30 days immersion, the Sb retention is about 65%, 52% and 55%, respectively for pure PLA, the composite at 10 vol% and 20 vol% under dynamic load, comparing to 75%, 70% and 72% under no load. Moreover, dynamic load could further mitigate the degradation of Mg wires by increasing convective transport of acidic products out of the composite.

The effect of poly(ethylene glycol) as plasticizer in blends of poly(lactic acid) and poly(butylene succinate)

2015 ◽  
Vol 133 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Weraporn Pivsa-Art ◽  
Kazunori Fujii ◽  
Keiichiro Nomura ◽  
Yuji Aso ◽  
Hitomi Ohara ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Ethylene Glycol ◽  
Poly Lactic Acid ◽  
Poly Ethylene Glycol ◽  
Butylene Succinate ◽  
Poly Ethylene
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