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Volumn 37, Issue 14, 2004, Pages 5430-5436

Origin of tensile stress-induced rate increases in the photochemical degradation of polymers

Author keywords

[No Author keywords available]

Indexed keywords

CHAIN ORIENTATION; PHOTOCHEMICAL DEGRADATION; PHOTOOXIDATIVE DEGRADATIONS; PLASTICIZED ANALOGUE;

EID: 3242810534     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma0496302     Document Type: Article
Times cited : (44)

References (59)
  • 43
    • 3242807967 scopus 로고    scopus 로고
    • note
    • 2)}/{w (mm) × l (mm)}, where M is the total weight hanging from the end of the film, w is the width of film, and l is its thickness.
  • 44
    • 0030574726 scopus 로고    scopus 로고
    • The apparatus used to monitor the reaction and monitor the light intensity for quantum yields is described in: Lindfors, B. E.; Nieckarz, G. F. Tyler, D. R.; Glenn, A. G. J. Photochem. Photobiol. A: Chem. 1996, 94, 101-105. The quantum yield procedure is essentially the same as described in that paper except that the samples in the current study were thin films rather than solution phase samples. Note that the apparatus can irradiate the film and monitor the reaction simultaneously, and hence the sample does not move during the irradiation (i.e., there is no need to remove the sample from the light beam to put it in a spectrophotometer). The bane of solid-state quantum yield measurements is repositioning the sample in its original position after each spectroscopic analysis. The apparatus used in this study was designed to circumvent this problem.
    • (1996) J. Photochem. Photobiol. A: Chem. , vol.94 , pp. 101-105
    • Lindfors, B.E.1    Nieckarz, G.F.2    Tyler, D.R.3    Glenn, A.G.4
  • 47
    • 3242812610 scopus 로고    scopus 로고
    • note
    • 48 These workers divided the infrared bands of PVC into three types. The first type consists of bands that characterize the configuration and conformation of the sample; these bands are always present, whatever the physical state of the sample. Most of the bands in the carbon-chlorine stretching region are of this type, at least for commercial PVC. The second type of band is associated with long stereoregular chain segments, These bands are present even in noncrystalline samples, which proves they are not due to the crystalline phase of PVC. The third type consists of bands that are characteristic of crystalline regions, and consequently their intensity can be used to assess the amount of crystallinity. It is interesting to note that the crystalline bands have peaks split into two components, caused by the interactions between neighboring chains in the crystal unit cell. The two bands cannot be observed simultaneously because one component of each pair is infrared active and the other one Raman active.
  • 51
    • 3242816672 scopus 로고    scopus 로고
    • note
    • -1 are characteristic of long and short, planar syndiotactic segments, respectively. Thus, the amount of long, planar syndiotactic segments increased with increased stress.
  • 56
    • 3242749579 scopus 로고    scopus 로고
    • note
    • 57.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.