摘要:

The ecologically sound disposal of scrap plastic materials is a matter of great concern and one that is certain to gain importance in the future. As amounts of scrap continue to grow and as disposal sites for landfill are unavailable, the disposal problem may well become acute. One area of particular concern is the disposal of scrap urethane foam.

ISSN:0360-2559    

DOI:10.1080/03602558208067725

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Plastic composites are members of both the oldest and the newest of materials. The first reinforced polymeric-based materials are recorded in Genesis and Exodus in the Bible as being used by the people of Babylonia and Mesopotamia around 4000–2000 B.C. These materials consisted of bitumen-based pitch for building products and bundles of papyrus reed embedded in a bitumen matrix for the construction of river boats [1]. The Hindu Vedas (written about 1000 B.C.) refers to the use of lac (a complex polymeric substance consisting of polyether and polyester chains) with fine sand for the manufacture of whetstones, which were known in India and China for several thousand years. There are a number of examples that could date back the origin of polymer composites into antiquity [1–3]. but the science of enhancing the properties of polymeric composites by the use of suitable fillers has been practiced extensively not earlier than the beginning of this century. For example, the tensile strength of polystyrene was modified by the incorporation of glass fillers only in the 1950s, half a century later than that predicted by Backeland in the early 1900s [2]. Carbon black is known to be a potential reinforcement for rubber for over 50 years. Although glass bead and glass fibers have been known for centuries, the use of these economical products in the plastic industry is relatively new [2].

ISSN:0360-2559    

DOI:10.1080/03602558208067726

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Members of the disubstituted vinyl polymer family [‒CH2‒CRR‒]nare of intense scientific interest because of the nature of their backbone and side chains. When R and R' are different groups, these polymers have the capability of forming stereoregular polymers with different physical properties [48]. The simplest regular arrangement of successive groups along a chain are the isotactic (Fig. lb), on which all R substituents are located on the same side of the zigzag plane, representing the chain stretched out in an all trans conformation; and the syndiotactic arrangement, in which the R groups alternate from side to side (Fig. la). In the atactic arrangement the R groups appear at random on either side of the zigzag plane.

ISSN:0360-2559    

DOI:10.1080/03602558208067727

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0360-2559    

DOI:10.1080/03602558208067724

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor