Polylactide Composition with Elastomer and Plasticizer
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Solution Overview
Problem
Polymers derived from renewable resources, such as polylactide (PLA), face challenges in achieving the necessary mechanical and thermal properties like elongation at break, heat resistance, and wettability for applications like moulded objects, particularly when using phthalate-free plasticizers, which can alter the glass transition temperature and impact toughness.
Innovation Solution
A polymer composition comprising polylactide, a chain modifier, and a phthalate-free elastomeric polymer, along with a plasticizer, is developed to enhance ductility, hardness, and wettability, with specific weight percentages of each component to achieve desired mechanical and thermal properties, including elongation at break greater than 200%, Shore hardness A between 60 and 95, and surface tension above 34 dyn/cm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If phthalate-free plasticizer is used in polylactide composition, then environmental safety is improved, but glass transition temperature changes and impact toughness deteriorates
Solution Approach 1:
The patent uses a composite system combining polylactide with elastomeric compounds (20-50 wt%) and phthalate-free plasticizers (10-40 wt%) to achieve both environmental safety and mechanical performance. The elastomeric phase acts as a toughening agent that compensates for the reduced impact toughness caused by the plasticizer.
Solution Approach 2:
The patent optimizes the composition parameters by controlling the weight percentages of elastomeric compounds (20-50 wt%) and plasticizers (10-40 wt%), and adjusting the glass transition temperature to -50°C to -20°C to achieve the desired balance between environmental safety and mechanical properties.
2Adaptability or versatility
If polylactide is used to replace PVC, then renewable resource usage is improved, but mechanical properties such as elongation at break and heat resistance deteriorate
Solution Approach 1:
The patent creates a composite material system where polylactide is combined with elastomeric compounds (20-50 wt%) and plasticizers (10-40 wt%) to achieve elongation at break greater than 200%, thereby matching or exceeding the mechanical properties of conventional PVC while maintaining renewable resource benefits.
Solution Approach 2:
The patent modifies the mechanical properties by controlling the glass transition temperature (-50°C to -20°C) and optimizing the composition ratios, enabling the polylactide-based material to achieve elongation at break >200% and heat resistance suitable for molding applications.
3Stability of the object's composition
If polylactide composition is formulated for high elongation at break, then ductility is improved, but heat resistance and wettability deteriorate
Solution Approach 1:
The patent carefully controls the glass transition temperature parameter (-50°C to -20°C) and the composition ratios of elastomeric compounds (20-50 wt%) and plasticizers (10-40 wt%) to achieve a balanced performance where elongation at break exceeds 200% while maintaining adequate heat resistance for molding applications.
Data Source
AI summary
The present invention relates to a polymer composition comprising polylactide and, based on the weight of this polymer, from 17 to 25 wt % of a chain modifier, from 30 to 55 wt % of an elastomeric polymer and from 20 to 45 wt % of a plasticizer. The invention also relates to the method of preparing said composition as well as to the method of manufacturing an article starting from said composition and the article per se.