Isopoly-Molybdic Acid Catalyst for High Molecular Weight PLA
Solution Overview
Problem
Existing methods for synthesizing high molecular weight polylactic acid (PLA) using ring-opening polymerization of lactide often result in products with impurities such as metal residues, affecting the quality and usage of PLA.
Innovation Solution
An organic frame material with isopoly-molybdic acid metal, specifically [Cu(tfbtb)0.5(β-Mo8O26)0.5(H2O)], is used as a catalyst for the ring-opening polymerization of lactide, which has a three-dimensional network structure and is synthesized through a hydrothermal reaction involving copper salt, sodium molybdate dihydrate, and 2,3,5,6-tetrafluoro-bis (1,2,4-triazole-1-methyl) benzene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If homogeneous organometallic compounds or Lewis acids are used as catalysts for ring-opening polymerization of lactide, then the polymerization efficiency is improved, but metal residues remain in the product affecting quality
Solution Approach 1:
The patent extracts the metal component from the homogeneous catalyst system and incorporates it into a solid support structure (organic frame material with isopoly-molybdic acid metal). This separation allows the catalytic activity to be maintained while the metal residues are confined within the solid structure, preventing them from contaminating the polymer product.
Solution Approach 2:
The patent creates a composite catalyst system combining organic frame material with isopoly-molybdic acid metal. This composite structure integrates the catalytic functionality of metal compounds with the beneficial properties of organic frameworks, achieving high polymerization efficiency while eliminating metal residue contamination through the solid support matrix.
2Stability of the object's composition
If metal derivatives of silica are used as support for ring-opening polymerization, then the catalyst stability is improved, but the research applicability to organic frame materials is limited
Solution Approach 1:
The patent changes the support material parameter from traditional inorganic silica to organic frame material. This parameter change enables the catalyst to maintain stability while expanding research applicability to organic-based catalytic systems, opening new avenues for catalyst design and application.
Solution Approach 2:
The patent develops an organic frame material catalyst that can be applied to various polymerization reactions, not just lactide polymerization. The universal applicability of this catalyst system allows it to function across different monomers and reaction conditions, significantly expanding research and industrial applicability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The organic frame material exhibits high catalytic activity, resulting in PLA with a weight average molecular weight exceeding 60,000, and offers potential applications in high-polymer materials, particularly in packaging and medical fields.
Implementation Method 1
The organic frame material having isopoly-molybdic acid metal is used as a catalyst for the ring-opening polymerization of lactide
Implementation Method 2
synthesized through a hydrothermal reaction involving copper salt, sodium molybdate dihydrate, and 2,3,5,6-tetrafluoro-bis (1,2,4-triazole-1-methyl) benzene
Data Source
AI summary
An organic frame material having isopoly-molybdic acid metal for manufacturing polylactic acid and method of manufacturing the same is provided. The chemical formula of the organic frame material having isopoly-molybdic acid metal is [Cu(tfbtb)0.5(β-Mo8O26)0.5(H2O)]. tfbtb is a 2,3,5,6-tetrafluoro-bis(1,2,4-triazole-1-methyl) benzene ligand, and [β-Mo8O26] is a β type octamolybdate anion. Sodium molybdate dihydrate, copper salt and organic ligand 2,3,5,6-tetrafluoro-bis (1,2,4-triazole-1-methyl) benzene undergo hydrothermal reaction in a closed condition to form the organic frame material having copper containing isopoly-molybdic acid metal that has a three-dimensional structure. The synthesis method is simple with high yield and reproducibility. The organic frame material having isopoly-molybdic acid metal shows high catalytic activity towards the ring-opening polymerization of lactide. The resulting polylactic acid has a weight average molecular weight exceeding 60,000. The polylactic acid has great potential in the fields of packaging materials and medical high polymer materials.