ISSN:1083-5601    

DOI:10.1002/vnl.730010202.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

ISSN:1083-5601    

DOI:10.1002/vnl.730010203.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractSeveral methods were developed to measure and identify the volatile species generated when PVC is heated to decomposition temperatures. PVC film compound containing various organotin stabilizers was processed under a range of typical conditions. The film samples were subjected to degradation temperatures of 210 to 230°C in both enclosed sampling systems (for optimum collection efficiency) and open systems that were designed to mimic working conditions. The collected samples were analyzed for amounts of hydrogen chloride, organotin compounds and organics in general. Variables such as type of stabilizer, degradation time and temperature, and sample thickness and fusion time were studied

ISSN:1083-5601    

DOI:10.1002/vnl.730010204.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractThe effect of processing variables on the rheological properties of PVC/ENR blends was investigated. The role of crosslinking in determining the flow behavior of blends was also examined by means of dynamically cured blends. It was found that PVC/ENR blends yield melts that are power law fluids. The flow of the melts improves with an increase in temperature and shear rate. However, the introduction of crosslinks reverses this trend, although under more rigorous conditions, the influence of crosslinks is superseded, and subsequently, flow becomes shear rate and temperature dependent. PVC/ENR systems also manifested elastic phenomena. The dependence of the elastic phenomena such as die swell and melt fracture on L/D ratio of the die was demonstrated.

ISSN:1083-5601    

DOI:10.1002/vnl.730010205.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractIn designing for stiffness of polymer products, one of the most common questions asked by design engineers is: “What are the effects of time and temperature on the modulus values listed on the product data sheet?” This paper outlines our approach to provide answers for glass reinforced Fiberloc® vinyl composites. Static and dynamic mechanical techniques and time‐temperature superposition principles were used to predict modulus as a function of both temperature and time under load. The predictions are being verified by long‐term creep tests at several temp

ISSN:1083-5601    

DOI:10.1002/vnl.730010206.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractCalendering of rigid and semirigid PVC (and ABS) compounds require an understanding of compound rheology and critical processing parameters. Compound rheology is modified with processing aids and lubricants. The choice of processing aid can be critical to achieving the desired rheology needed for calendering. This paper will focus on defining calendering rheology parameters as a function of a super high molecular weight MMA/SAN copolymer processing aid. These rheology parameters will be defined in terms of mill roll gap pressure, adhesive force (compound roll release) melt temperature, and shear rate. The ability to measure these parameters via a computerized two roll mill and relate this data to the actual calendering line will also be discussed.

ISSN:1083-5601    

DOI:10.1002/vnl.730010207.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractTitanium dioxide is widely used as a cost‐effective UV radiation protector for exterior PVC applications, particularly vinyl building products. As the exterior surface weathers by oxidation, an increasing number of pigment‐air interfaces are formed, resulting in increased light scattering. This increased light scattering is often mistakenly described as color fade. Results are shown to clearly measure the difference between this titanium dioxide opacity effect versus color pigment fade. The effect of several chemicals on surface color restoration and long‐term color retention is exp

ISSN:1083-5601    

DOI:10.1002/vnl.730010208.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractIn an effort to improve the utility and processing of PVC, additives like heat distortion modifiers and plasticizers are often added. While the economics of using PVC are highly favorable, they are limited in their dimensional stability at high temperatures. Blending with a component having better dimensional stability at higher temperatures is therefore investigated. In this paper, use of a styrenic copolymer, styrene acrylonitrile (SAN), and a substituted styrenic copolymer, alpha methyl styrene acrylonitrile (αMSAN), is studied. The glass transition‐composition behavior is studied through dynamic mechanical measurements. Heat distortion test results of the blend in compositions of 0–100 in 10% increments indicate enhanced DTUL above certain compositions. Rheological characterization is done both in the low strain steady shear and dynamic mode. High shear rate testing was done. In general it was found that while the styrenic copolymer exhibits a plasticization of the PVC glass transition, the substituted styrene, by maximizing the repulsive interaction effects, pushes the system to a limited partial miscibi

ISSN:1083-5601    

DOI:10.1002/vnl.730010209.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractA modified form of aluminum trihydroxide has been synthesized that is thermally stable to approximately 350°C. Flame retardant and smoke generation performance in low melting temperature thermoplastics, such as polyvinyl chloride, polypropylene, and ethylene vinylacetate, are comparable to unmodified ATH. The increased thermal stability also allows this material to be used in thermoplastics with higher melting temperatures, such as polycarbonate, polybutylene terephthalate, and polyphenylene oxide, where ATH cannot be used

ISSN:1083-5601    

DOI:10.1002/vnl.730010210.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY

摘要:

AbstractParts used under the hood of automobiles are increasingly made from polymeric materials. These parts are often exposed to relatively high temperatures and corrosive chemicals, exposure conditions that can affect their long‐term performance. This paper provides quantitative information on the combined effect of high temperatures and corrosive chemicals on the long‐term performance of glass fiber reinforced nylon 6,6 parts. Glass fiber reinforced nylon 6,6 is one of the more widely used polymers in underhood applications. Parts made from this material include radiator headers, oil caps, and, more recently, intake manifolds. In this project the in‐service environmental conditions imposed on an oil cap and radiator were monitored, and the exposed parts examined by dynamic mechanical analysis. Data taken from the exposed parts were compared to comparably laboratory aged samples. The basic finding was that glass fiber reinforced nylon 6,6 parts should have an excellent survival rate in the parts investi

ISSN:1083-5601    

DOI:10.1002/vnl.730010211.n

出版商:Society of Plastics Engineers    

年代:1995

数据来源: WILEY