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Oxidized Starch-Reinforced Aqueous Polymer Isocyanate Cured with High-Frequency Heating.

Yanrui Li^1,2, Detao Kong^1,2, Qinghua Yang^1,2

¹Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, China.

|June 19, 2024

Summary

Adding oxidized starch to aqueous polymer isocyanate (API) improves its mechanical and bonding properties after high-frequency curing. Higher oxidized starch content leads to greater enhancements in API performance.

Keywords:

aqueous polymer isocyanate bonding performance high frequency mechanical properties oxidized starch

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Area of Science:

Materials Science
Polymer Chemistry
Electromagnetic Applications

Background:

Aqueous polymer isocyanate (API) systems are utilized in various applications.
Improving the mechanical and bonding properties of API is crucial for enhanced performance.
Electromagnetic energy absorption capabilities are being explored for material enhancement.

Purpose of the Study:

To investigate the impact of oxidized starch content on the properties of API after high-frequency curing.
To explore the underlying mechanisms responsible for property enhancements.
To optimize oxidized starch concentration for improved API performance.

Main Methods:

Preparation of oxidized starch/styrene-butadiene rubber systems.
Evaluation of bonding and mechanical properties of API with varying oxidized starch content.
High-frequency curing of API formulations.
Thermodynamic testing and material characterization for mechanism exploration.

Main Results:

Oxidized starch addition significantly enhanced mechanical properties and bonding of API post-curing.
Increased oxidized starch content correlated with greater improvements in API properties.
At 25 wt% oxidized starch, API bonding improved by 25.1% (ambient) and 26.4% (aged), with tensile strength and Young's modulus increasing by 18.7% and 22.6% respectively.

Conclusions:

Oxidized starch acts as an effective additive to improve API properties through high-frequency curing.
The enhancement mechanism likely involves increased dielectric loss, leading to greater cross-linking.
This research offers a pathway for developing advanced API materials with superior electromagnetic energy absorption and mechanical integrity.