ISSN:0193-7197    

DOI:10.1002/vnl.730040402

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractSimple substitution of PVC copolymer dispersion resins can offer some processing advantages over their homopolymer counterparts, in either reduced temperatures or shorter cycles. Elevated storage temperatures can affect the viscosity of the copolymer compound, but minimal reformulating (substituting a less‐solvating plasticizer in part or whole or pre‐wetting the compound with a few parts of a diluent, such as mineral spirits) can usually restore stability. The formulator must be the final judge of the compensatory steps to be ta

ISSN:0193-7197    

DOI:10.1002/vnl.730040403

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractRigid PVC compounds will be specified for an ever‐increasing number of diverse applications within the next few years because of their excellent cost‐performance balance. Molders with experience and equipment to run these compounds will share in this growing business. Those grounded in the basic principles of molding rigid PVC compounds will gain the confidence and develop the capability for processing many other thermoplastics, besides reaping the prof

ISSN:0193-7197    

DOI:10.1002/vnl.730040404

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractBecause a blend of limited miscibility level produces high damping characteristics in a composite, copolyurethanes of different molecular structure were synthesized to achieve a desired level of miscibility in PVC. A study of the viscoelastic properties of blends of a 50‐to‐50 weight ratio of polyurethanes and PVC showed a steady decrease in miscibility on replacement of polyurethanes synthesized from polycaprolactone diols with a molecular weight of 2000, with polyurethanes synthesized by poly(ethylene oxide) diols, up to 80 mol percent, whereupon the polyurethanes became immiscible. The temperature range of damping for a particular polyurethane could be controlled by adjusting the ratio of PVC to the polyurethane. More polyurethane in the blend shifts the damping range toward lower temperature, and vice ve

ISSN:0193-7197    

DOI:10.1002/vnl.730040405

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractThe effect of various levels of calcium‐carbonate filler on the physical properties of flexible PVC ranges from no effect on volume resistivity to a dramatic effect on processability. The effects are dependent upon the mean particle size and coating of the filler. Processors need to recognize the quantitative relationship between levels of calcium carbonate in flexible PVC and the resin's physical propertie

ISSN:0193-7197    

DOI:10.1002/vnl.730040406

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractA comparison has been made of the effect of ultraviolet and solar radiation on plasticised and unplasticised PVC. It has been shown that, when the polymer, plasticised with either a phthalate or trimellitate ester, is exposed to short‐wavelength ultraviolet radiation (<292 nm), the photodehydrochlorination of the polymer is retarded by the plasticiser. It has also been shown that, when longer‐wavelength radiation is used, the dehydrochlorination is accelerated by the plasticiser. In each case, the effect of the trimellitate is greater than that of the phthalate. Possible mechanisms for the reactions at both long and short wavelengths are considered, and the role of the plasticiser is explained in terms of its electronic absorption spect

ISSN:0193-7197    

DOI:10.1002/vnl.730040407

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractConductive‐plastic enclosures, to compete successfully in the electronics industry, must be easily and rapidly moldable into a low‐cost, lightweight, structurally sound, flame‐retardant, and electrically‐conductive rigid part. Such a material must combine the design flexibility and moldability of a plastic with the EMI shielding properties approaching those of a metal. PVC filled with aluminum flake makes an excellent conductive composite, provided it is correctly formulated and processed. A critical concentration of metallic filler must be used; it is a function of the plastic formulation; the uniformity of the filler's dispersion; the filler type, size, and morphology; and the method by which it was compounded into th

ISSN:0193-7197    

DOI:10.1002/vnl.730040408

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractPVC‐based plastics have a good record for injection‐molding processability, early deficiencies having been corrected with additives. Because metallic flakes have unusual aspect ratios compared with conventional fillers, it has been necessary to determine the general effects of flake on injection molding. Specific objectives of the investigation were to verify processing latitude, set guidelines for optimum processing, determine the effects of processing on physical and electrical properties, and look for unusual effects due to filler configuration. Flow properties of the PVC composite were shown to be adequate for the majority of applications, and mold‐filling ability of the PVC composite was found equal to that of flame‐retarded polycarbonate and close to that of flame‐ret

ISSN:0193-7197    

DOI:10.1002/vnl.730040409

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY

ISSN:0193-7197    

DOI:10.1002/vnl.730040401

出版商:Society of Plastics Engineers, Inc.    

年代:1982

数据来源: WILEY