Polyester polymer nanocomposites
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Solution Overview
Problem
Conventional methods for producing polybutylene succinate (PBS) polymers generate hazardous waste and use non-renewable, potentially toxic chain extenders, leading to susceptibility to thermal and hydrolytic degradation and sensitivity to processing conditions, while requiring additional processing steps.
Innovation Solution
A method involving polymerizing alkane diol and alkane diacid monomers with dispersed polysaccharide nanocrystals, such as cellulose nanocrystals, in a one-pot reaction to form polyester polymer-polysaccharide nanocomposite resins, which are then esterified and condensed to create polybutylene succinate nanocomposites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional PBS production methods are used, then polymer can be produced, but hazardous waste (THF) is generated and toxic chain extenders are required
Solution Approach 1:
The invention changes the chemical parameters of the polymerization process by using diacid agents instead of traditional chain extenders, eliminating the formation of THF byproduct and removing the need for toxic diisocyanate agents. This parameter change transforms the chemical reaction pathway to achieve the same polymerization goal without harmful substances.
Solution Approach 2:
The invention extracts and removes the harmful elements (THF byproduct formation and toxic chain extenders) from the PBS production process. By eliminating these problematic components and replacing them with safer alternatives, the process achieves polymer production without generating hazardous waste or requiring toxic substances.
2Ease of manufacture
If linear aliphatic polyesters like PBS are used, then processability is improved, but thermal and hydrolytic degradation susceptibility increases
Solution Approach 1:
The invention creates a composite polyester structure by using diacid agents that form crosslinked or branched networks within the linear polyester chains. This composite approach combines the processability of linear polyesters with enhanced thermal and hydrolytic stability through the integrated network structure, resolving the contradiction between ease of manufacture and reliability.
3Strength
If diisocyanate chain extenders are used to increase molecular weight, then polymer properties improve, but additional processing steps and toxic substance handling are required
Solution Approach 1:
The invention merges the functions of chain extension and polymerization into a single integrated process using diacid agents. Instead of requiring separate steps for polymerization and chain extension with diisocyanates, the diacid agent performs both functions simultaneously, reducing processing complexity while achieving the desired molecular weight and polymer properties.
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 method reduces waste, utilizes renewable materials, and enhances polymer properties such as yield stress, tensile strength, modulus, and thermal stability, while maintaining processability.
Implementation Method 1
polymerizing an alkane diol monomer and an alkane diacid agent monomer in a mixture comprising dispersed polysaccharide nanocrystals
Implementation Method 2
polymerizing an alkane diol monomer and an alkane diacid agent monomer
Implementation Method 3
a catalyst and one or more optional additives under conditions sufficient to produce a polymer-polysaccharide nanocomposite resin
Implementation Method 4
The polybutylene succinate oligomers are condensed to form a polybutylene succinate nanocomposite
Data Source
AI summary
Aspects of the present disclosure include compositions of and methods for producing a polymer-polysaccharide nanocomposite resin, including polymerizing an alkane diol monomer and an alkane diacid agent monomer in a mixture comprising dispersed polysaccharide nanocrystals, a catalyst and one or more optional additives under conditions sufficient to produce a polymer-polysaccharide nanocomposite resin. Aspects of the present disclosure further include compositions of and methods for producing a polybutylene succinate nanocomposite, including dispersing cellulose nanocrystals in 1,4 butanediol (BDO) to form a cellulose-BDO dispersion and esterifying the cellulose-BDO dispersion and succinate anhydride to form a plurality of polybutylene succinate oligomers. The polybutylene succinate oligomers are condensed to form a polybutylene succinate nanocomposite.