Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 138, Issue 2, Pages -Publisher
WILEY
DOI: 10.1002/app.49676
Keywords
crosslinking; damping coating; emulsion polymerization; latex; waterborne coatings
Categories
Funding
- National Key Research and Development Program of China [2016YFC0204402]
- Fundamental Research Funds for the Central Universities [JD 2005]
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This study synthesized a series of polymer latexes with different crosslinking agents and network distributions by controlling the emulsion polymerization process. It was found that the variation in crosslinking significantly affected the dynamic behavior of the latex and film properties. The sequential monomer feeding method showed good extensional damping performance, while the power monomer feeding method exhibited good constrained layer damping when using specific crosslinking agents.
Latex polymers with precisely designed dynamic mechanical behavior are the key for waterborne damping coatings, which are widely desired in noise and vibration reduction with additional environmental benefits. In this work, we synthesized series of polymer latexes with various crosslinking agents (CA) and network distributions through the control on emulsion polymerization processes. We have revealed that the variation on crosslinking can significantly direct the latex behavior under dynamic conditions as well as its films. The variables involve the CA composition, the functionality, the crosslinking manner, the hydrophilic-hydrophobic feature as well as the feeding method. Although all the latex films showed the damping peaks locating in the range from -10 to 70 degrees C, their damping behaviors were quite different. Suggested by the empirical parameters of LA and TA, the product from sequential monomer feeding method tended to give good extensional damping performance. Especially when the crosslinking of diacetone acrylamide (DAAM)/adipic dihydrazide was applied, there was a linear increase on LA with the increasing dosage of DAAM from 0 to 10 mmol in the final monomer addition batch. Meanwhile, good constrained layer damping is expected on the products from the power monomer feeding method with the maximum CA dosage shown below 7.5 mmol. The best TA was achieved when the CA of divinylbenzene was used in the dosage of 5 mmol. These results would be valuable to be referenced in the engineering on organic damping materials toward modern industrial and vehicles applications.
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