Paramylon Resin Acyl Composition for Thermoplastic Bioplastic Molding
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Solution Overview
Problem
Conventional bioplastics made from edible components like starch face challenges in thermoplasticity, water resistance, and mechanical characteristics, while bioplastics derived from non-edible components such as cellulose and paramylon lack sufficient thermoplasticity and water resistance due to strong intermolecular forces and high water absorption.
Innovation Solution
A paramylon-based resin is developed by substituting hydrogen atoms of paramylon with a long-chain aliphatic acyl group having 14 or more carbon atoms and a short-chain acyl group having 2 or 3 carbon atoms, with specific degrees of substitution to achieve a weight-average molecular weight of 70000 to 140000, resulting in improved thermoplasticity and mechanical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If paramylon is used as a bioplastic material, then it provides a non-edible renewable resource alternative, but it exhibits poor thermoplasticity and water resistance due to strong hydrogen bonding and high hydrophilicity
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of paramylon through controlled substitution of hydroxy groups with acyl groups having specific chain lengths (1-12 carbon atoms). This chemical modification changes the physical parameters of the material, reducing intermolecular hydrogen bonding and improving thermoplasticity while maintaining water resistance properties.
Solution Approach 2:
The patent creates a composite material structure by combining paramylon backbone with acyl side chains of varying lengths. The resulting paramylon derivative integrates the renewable resource benefit of paramylon with the improved processing properties of acyl-modified structures, achieving both bioplastic applicability and enhanced thermoplasticity.
2Ease of manufacture
If acyl groups are introduced to improve thermoplasticity, then processing properties improve, but excessive substitution reduces mechanical strength
Solution Approach 1:
The patent optimizes the degree of substitution parameter to balance thermoplasticity and mechanical strength. By controlling the substitution level within specific ranges and using acyl groups with 1-12 carbon atoms, the material achieves sufficient thermoplasticity for processing while preserving adequate mechanical characteristics.
Solution Approach 2:
The patent applies local quality by introducing acyl groups at specific positions on the paramylon structure rather than uniform modification throughout. This selective substitution at hydroxy groups allows localized modification of intermolecular forces while preserving the overall structural integrity and mechanical properties of the paramylon backbone.
3Stability of the object's composition
If conventional cellulose is used as a bioplastic material, then it provides good structural stability, but it lacks thermoplasticity due to strong intermolecular hydrogen bonds
Solution Approach 1:
The patent applies parameter changes by chemically modifying the cellulose-like paramylon structure through acylation. This modification changes the intermolecular interaction parameters, reducing hydrogen bonding strength while maintaining the structural stability of the polysaccharide backbone, thereby enabling thermoplasticity.
Solution Approach 2:
The acyl groups act as intermediary elements between the paramylon backbone and the external environment. These intermediary acyl chains interfere with direct hydrogen bonding between paramylon chains, reducing intermolecular forces and enabling thermoplastic processing while the paramylon backbone maintains structural stability.
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 paramylon-based resin exhibits enhanced thermoplasticity, water resistance, and mechanical properties, including Izod impact strength of 5.0 kJ/m2 or more and a melt flow rate of 2 g/10 min or more, suitable for molding applications.
Implementation Method 1
the thermoplasticity and water resistance of the cellulose derivative are improved
Implementation Method 2
The introduced long-chain organic group functions as a hydrophobic internal plasticizer, and the thermoplasticity and water resistance of the cellulose derivative are improved
Implementation Method 3
paramylon is not thermoplastic because it has strong intermolecular forces due to hydrogen bonds derived from hydroxy groups
Data Source
AI summary
A paramylon-based resin having a weight-average molecular weight of paramylon in a range of 70000 to 140000, and formed by substituting hydrogen atoms of hydroxy groups of a paramylon with a long-chain component being a linear saturated aliphatic acyl group having 14 or more carbon atoms and a short-chain component being an acyl group (acetyl group or/and propionyl group) having 2 or 3 carbon atoms, wherein a degree of substitution with the long-chain component (DSLo) and a degree of substitution with the short-chain component (DSSh) satisfy the following conditional expressions (1) and (2), Izod impact strength is 5.0 kJ/m2 or more, and an MFR (melt flow rate at 210° C. and under a load of 5 kg) is 2 g/10 min or more. To provide a paramylon-based resin excellent in mechanical characteristics and thermoplasticity2.2≤DSLo+DSSh≤2.8 (1)5≤DSSh/DSLo≤25 (2).