Topic
Polyphthalamide
About: Polyphthalamide is a research topic. Over the lifetime, 187 publications have been published within this topic receiving 928 citations.
Papers published on a yearly basis
Papers
TL;DR: In this paper, the authors summarized current research aimed at using polymer materials for glazing and heat exchanger components in solar water heating systems and described functional requirements, relevant polymer properties and an approach for selecting polymers.
Abstract: This paper summarizes current research aimed at using polymer materials for glazing and heat exchanger components in solar water heating systems. Functional requirements, relevant polymer properties and an approach for selecting polymers are described for each of these components. Glazing must have high transmittance across the solar spectrum and withstand long term exposure to ultraviolet (UV) light. Candidate glazing materials were tested outdoors for one year in Golden, Phoenix and Miami, as well as exposed for over 300 days in an accelerated testing facility at a concentration ratio of two at the National Renewable Energy Laboratory. Measurements of hemispherical transmittance indicate that a 3.35 mm polycarbonate sheet with a thin film acrylic UV screen provides good transmittance without excessive degradation. The primary challenge to designing a polymer heat exchanger is selecting a polymer that is compatible with potable water and capable of withstanding the high pressure and temperature requirements of domestic hot water systems. Polymers certified for hot water applications by the National Sanitation Foundation or currently used in heat exchangers and exhibit good high temperature characteristics were compared on the basis of a merit value (thermal conductance per unit area per dollar) and manufacturer's recommendations. High temperature nylon (HTN), polypropylene (PP) and cross linked polypropylene (PEX) are recommended for tube components. For structural components (i.e. headers), glass reinforced high temperature nylon (HTN), polyphthalamide (PPA), polyphenylene sulphide (PPS) and polypropylene (PP) are recommended.
58 citations
TL;DR: In this paper, polyphthalamide microcapsules were prepared by interfacial polycondensation reactions between each of 1, 6-hexamethylenediamine and diethylenediamines under various conditions.
Abstract: Polyphthalamide microcapsules were prepared by the interfacial polycondensation reactions between each of 1, 6-hexamethylenediamine and diethylenediamine and each of o-, m-, and p-phthaloyl dichlorides under various conditions. The size and size distribution of the microcapsules formed were determined and the factors affecting them were of studied. Favorable conditions were suggested to obtain the microcapsules of uniform size in a high yield.
49 citations
1 Oct 1971
TL;DR: In this article, the authors investigated the permeability of polyphthalamide microcapsules to various electrolytes and found that their permeability constants were of the order of 10−8 cm/sec and almost temperature-independent.
Abstract: SummaryThe permeability of polyphthalamide microcapsules to various electrolytes was studied. The permeability constants were found to be of the order of 10−8 cm/sec and almost temperature-independent. The surprisingly low permeation rate was ascribed to the formation of a stable diffusion layer of the electrolytes in the interior of microcapsules. The insignificant temperature effect was interpreted as being due to the presence of adsorbed Tween 20 molecules on the microcapsule membrane.ZusammenfassungEs wurde die Durchlässigkeit von Polyphthalamidmikrokapseln für verschiedene Elektrolyten untersucht. Die Durchlässigkeitskonstanten liegen in der Größenordnung von 10−8 cm/sec und sind von der Temperatur fast unabhängig. Die unerwartet niedrige Permeationsgeschwindigkeit wurde der Bildung einer stabilen Diffusionsschicht des Elektrolyten innerhalb der Mikrokapseln zugeschrieben. Der geringe Temperatureffekt wurde auf die Existenz der an die Mikrokapselmembranen adsorbierten Moleküle von Tween 20 zurückgeführt.
35 citations
Patent•
21 Mar 1990TL;DR: Improved polyphthalamide compositions which possess desirable heat resistance properties comprise a crystalline polyphamide component and a particulate thermotropic liquid crystalline polymer component in an amount sufficient to nucleate a melt of the polyamide.
Abstract: Improved polyphthalamide compositions which possess desirable heat resistance properties comprise a crystalline polyphthalamide component and a particulate thermotropic liquid crystalline polymer component in an amount sufficient to nucleate a melt of the polyphthalamide. Molded articles prepared from these compositions exhibit excellent mechanical and thermal properties, including expecially high crystalline uniformity throughout even when molded using molds heated below Tg of the polyphthalamide component, often facilitating molding using steam or hot water-heated molds.
31 citations
Patent•
8 Aug 2012
TL;DR: In this article, a high temperature nylon PPA reinforcing material and a preparation method for domestic volume production and future quantity demand in the domestic market is presented. But the method is not suitable for high temperature polyamide materials.
Abstract: The invention discloses a high temperature nylon PPA reinforcing material and a preparation method thereof. The high temperature nylon PPA reinforcing material comprises the following components in part by weight: 30 to 50 parts of polyphthalamide, 8 to 20 parts of polyamide, 10 to 15 parts of main fire retardant, 3 to 5 parts of assistant fire retardant, 30 to 45 parts of filling reinforcing agent, 0.2 to 0.6 part of antioxidant, 0.2 to 0.8 part of lubricant, and 0.3 to 0.6 part of nucleating agent. The invention overcomes the defects of lower liquidity and difficult processing of the PPA because a polyamide material is introduced; the polyamide material has the characteristics of high liquidity and similar molecular structure, and can be well fused with the PPA material, so that the liquidity is improved, the processing temperature is greatly reduced, and the processing procedure is simplified; and a modified material with excellent performance after being reinforced by a glass fiber is equal to foreign brand materials, and plays a role in laying the foundation for domestic volume production and future quantity demand in the domestic market.
28 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 5 |
| 2020 | 7 |
| 2019 | 14 |
| 2018 | 6 |
| 2017 | 9 |
| 2016 | 7 |