摘要:

The furfuryl alcohol and furan resins comprise a group of polymeric liquids derived from furfuryl alcohol or compounds containing the basic furan ring structure. As liquids they have viscosities ranging from approximately 100 to 300,000 cP. They can be resinified further by conventional acid catalysis and cured to provide infusible solid products having high hardness, flexural strength, and chemical resistance to most acids, alkalies, and solvents. They may also be converted to flexible solids by cross-linking with suitable catalyses such as polyfunctional amines [1] or by the use of modifying copolymers and controlled curing conditions [2,3].

ISSN:0360-2559    

DOI:10.1080/03602557408545025

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Ultraviolet radiation, either alone or in combination with oxygen, heavy metals, etc. profoundly influences the mechanical behavior of most polymers. Indeed, the preparation of photodegradable resistant polymers, or of additives to prevent or reduce the photodegradation of polymers, have been major fields of investigation. Today, however, the design of polymers that will photodegrade in a controlled manner is gaining importance in view of environmental concerns. An understanding of the photodegradability of polymers is, therefore, of interest.

ISSN:0360-2559    

DOI:10.1080/03602557408545026

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The concrete-polymer composite materials program at Brookhaven National Laboratory is directed at developing both improved and new concrete materials by combining the ancient technology of hydraulic cement concrete formation with the more modern technology of polymer chemistry. A wide range of concrete-polymer composites are being investigated as follows.

ISSN:0360-2559    

DOI:10.1080/03602557408545027

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The total United States production in 1972 of plastics, synthetic rubbers, and synthetic fibers amounted to 37 billion pounds, up an average of 14.6% over the previous year [1]. While these figures are justifiably a source of joy to producers, processors, and fabricators of these polymeric materials, two problems cloud the horizon. First, the nation is entering a so-called “energy crisis” and the ultimate source of the vast majority of polymer produced in this country is petroleum (including natural gas). While only a small portion of the total petroleum production goes into plastics (perhaps 1% or so), the shortage of petroleum-based feedstocks is already forcing up the price of monomers and the polymers made from them. Second, there is increasing pressure to find answers to the question “What do we do with these polymers when objects made form them are discarded?” Currently, polymers account for only about 3% by weight of the total waste mix, although this figure is rising. They present significant disposal problems. As a result of their low density and the fact that much polymer waste is in the form of empty containers, they waste available sanitary landfill space. They are not ordinarily subject to corrosive or to microbial degradation. They are difficult to incinerate, at least with present equipment and operating procedures.

ISSN:0360-2559    

DOI:10.1080/03602557408545028

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor