EFFECTS OF MASTICATION ON THE DISTRIBUTION OF MOLECULAR-WEIGHTS AND ON THE MECHANICAL-PROPERTIES OF NATIVE AND COMMERCIAL DENTAL GUTTA-PERCHA (TRANS-POLYISOPRENE)

被引：5

作者：

ARVANITOYANNIS, I ^{[1
]}

BLANSHARD, JMV ^{[1
]}

KOLOKURIS, I ^{[1
]}

机构：

[1] ARISTOTELIAN UNIV SALONIKA,SCH DENT,DEPT DENT PATHOL & THERAPEUT,GR-54606 SALONIKA,GREECE

来源：

POLYMER INTERNATIONAL | 1992年 / 27卷 / 01期

关键词：

GUTTA PERCHA; MASTICATION; MECHANICAL PROPERTIES; MOLECULAR WEIGHT DISTRIBUTION; POLYISOPRENE;

D O I：

10.1002/pi.4990270103

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Mastication of gutta percha (trans-polyisoprene) resulted in the selective scission of molecules, producing a narrower distribution of lower molecular weights. The mechanical properties of the samples also underwent a significant change due to mastication. The greater the content of incompatible substances (salts and oxides) in commercial gutta percha, the more substantial were these effects. The atmosphere (air, N2, O2) in which the experiments were conducted yielded significantly different results. The decrease in molecular weight was far greater in an 02 atmosphere than under a current of nitrogen or air, owing to the combination of double bonds with 02.

引用

页码：7 / 15

页数：9

共 40 条

[1] DEGRADATION OF POLYSTYRENE DURING EXTRUSION
ARISAWA, K
PORTER, RS
[J]. JOURNAL OF APPLIED POLYMER SCIENCE, 1970, 14 (04) : 879 - &
[2] ARVANITOYANNIS I, UNPUB
[3] BARAMBOIM NK, 1958, ZH FIZ KHIM+, V32, P1248
[4] BARAMBOIM NK, 1955, THESIS I PHYSICAL AN, P33
[5] BARAMBOIM NK, 1964, MECHANOCHEMISTRY POL, P20
[6] BARAMBOIM NK, 1975, TECHNIK, V30, P73
[7] Bueche F., 1960, J APPL POLYM SCI, V4, P101, DOI 10.1002/app.1960.070041016
[8] Busse W. F., 1938, P 2 RUBB TECHN C, P288
[9] Mastication of rubber - An oxidation process
Busse, WF
[J]. INDUSTRIAL AND ENGINEERING CHEMISTRY, 1932, 24 : 140 - 146
[10] TEMPERATURE EFFECT ON POLYMER MECHANOCHEMISTRY
CASALE, A
[J]. JOURNAL OF APPLIED POLYMER SCIENCE, 1975, 19 (05) : 1461 - 1473

← 1 2 3 4 →