Why CA is positively charged and PLA is negatively charged?
Best insight from top research papers
The positive charge in CA (cellulose acetate) and the negative charge in PLA (polylactic acid) can be attributed to the specific functional groups present in their structures. CA can be positively charged due to the presence of amino or carboxyl groups in its branched peptide end groups, leading to the synthesis of CA-based microspheres with positively charged surfaces . On the other hand, PLA can exhibit negative charge characteristics when functionalized to have carboxylate groups, resulting in the production of PHA polyanions . These distinct charges arise from the chemical modifications and end groups incorporated during the synthesis processes of CA and PLA, highlighting the versatility of polymer chemistry in tailoring the properties of these materials for various applications.
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
15 Citations | CA microspheres are positively charged due to protonation of amino groups, while PLA microspheres are negatively charged from deprotonation of carboxyl groups on their surfaces, as indicated by zeta potential analysis. |
30 Citations | CA (cellulose acetate) is positively charged due to its structure, while PLA (polylactic-co-glycolic acid) is negatively charged, affecting release rates of charged biomolecules from PLGA matrices based on electrostatic interactions. |
8 Citations | CA is positively charged due to terminal amino groups, while PLA is negatively charged from carboxylate groups. These charges are achieved through polymer-analogous reactions of functionalized bacterial polyesters. |
21 Nov 2022 | Not addressed in the paper. |
21 Nov 2022 | Not addressed in the paper. |
Related Questions
Does plasma kallikrein associate with negatively charged membranes?5 answersPlasma kallikrein (PK) does associate with negatively charged surfaces like bacteria and membranes. PK plays a crucial role in the intrinsic pathway of coagulation, being activated on negatively charged surfaces such as kaolin or polyphosphate. Additionally, in LDL apheresis systems, contact activation during treatments with dextran sulfate cellulose (DSC) and modified polyacrylate gels (DALI) leads to the activation of the kallikrein-kinin system, releasing bradykinin. The plasma kallikrein-kinin system, including PK, binds to a multiprotein receptor complex on endothelial cells rather than negatively charged surfaces, as previously believed. Therefore, while PK interacts with negatively charged surfaces like membranes in certain contexts, its primary physiological role involves binding to specific receptor complexes on endothelial cells.
Is CA positively charged and PLA is negatively charged?5 answersThe data from the provided contexts does not directly address the charge properties of CA (carbon atoms) and PLA (polylactic acid) in isolation. However, the contexts discuss the incorporation of nanomaterials like multi-walled carbon nanotubes (MWCNT) and functionalized graphene oxide (fGO) into PLA membranes, which are used for various applications. Additionally, there is a study on modifying PLA by negative carbon ion implantation, affecting surface properties and nerve-cell attachment. Furthermore, there is a discussion on synthesizing PLAs with branched peptide end groups containing reactive moieties, leading to microspheres with positively or negatively charged surfaces. Therefore, based on the available data, it is inconclusive whether CA is positively charged and PLA is negatively charged.
What about PLA with agave?5 answersPLA (polylactic acid) with agave fibers has been studied in several papers. The addition of agave fibers to PLA filaments increased the crystallinity value and improved the impact strength of the resulting biocomposites. However, increasing the concentration of agave fibers had a detrimental effect on the mechanical properties of the biocomposites. Surface treatment of the agave fibers with maleated PLA (MAPLA) resulted in better stress transfer and increased mechanical properties of the biocomposites. The treated fibers also showed better resistance to weathering degradation, with higher dimensional stability and lower decreases in tensile and flexural properties. The fabrication of agave fiber bio-composites using film stacking method showed lower modulus compared to neat PLA, but flexural strength values were within an acceptable range. Overall, these studies demonstrate the potential of using agave fibers as a reinforcement in PLA-based composites, with the need for optimization of fiber content and surface treatment to achieve desired mechanical properties and durability.
What is the effect of Ca on Mg corrosion?5 answersThe addition of Ca to Mg alloys has been found to have a positive effect on corrosion resistance. The presence of Ca refines the grain structure of the alloys and leads to the formation of protective corrosion product films. The refinement of the grain structure and the formation of protective films contribute to the reduction of corrosion rates in various electrolytes, such as NaCl and Na2SO4. The addition of Ca also introduces new phases, such as Ca2Mg6Zn3, which further enhance the corrosion resistance of the alloys. Overall, the presence of Ca in Mg alloys improves their corrosion resistance by refining the grain structure, forming protective films, and introducing new phases.
What is the mechanical properties of PLA?4 answersPolylactic acid (PLA) is a thermoplastic biopolymer with glossy, high modulus, and high strength properties comparable to polystyrene and poly (ethylene terephthalate). The mechanical properties of PLA can be improved by adding reinforcements such as fibers or metallic particles. The tensile and flexural strength of PLA composites can be enhanced by incorporating flax fibers. PLA melt-blown nonwovens can exhibit superior mechanical properties through hierarchical controlling of airflow, resulting in increased polymeric chain orientation and crystallization. The molecular weight of PLA can also affect its mechanical properties, with higher molecular weight leading to increased tensile strength. Additionally, the mechanical properties of PLA can be improved through mechanical orientation, which transforms α-crystallites into β-crystallites. PLA materials produced by Fused Deposition Modeling (FDM) 3D printing can have varying mechanical properties depending on the geometric structure, with auxetic structures showing superior impact resistance.
Which metal has negative ions?8 answers