Effects of chitosan on thermal stability of PVC

doi:10.19491/j.issn.1001-9278.2022.07.010

Abstract

Abstract:

A series of polyhydroxyl compounds with a low price were selected， and their static thermal stability was comparatively investigated using a Congo red method. The results indicated that the presence of chitosan could generate an optimal static thermal stabilizing effect on PVC. The static thermal stabilizing effects of chitosan and conventional primary heat stabilizers， including calcium stearate， zinc stearate and lanthanum stearate， were further evaluated using the Congo red method， and their anti?discoloration ability was compared using a thermal aging oven method. The dynamic thermal stabilizing effect on PVC was compared between chitosan and conventional stabilizers using a torque rheometer. The effect of chitosan on the thermal degradation process of PVC was studied through thermogravimetric analysis. Chitosan exhibited an optimal thermal stabilizing effect on PVC with static and dynamic thermal stabilization time of 4 020 and 1 355 s， respectively.

Key words: poly（vinyl chloride）, heat stabilizer, chitosan

CLC Number:

TQ325.3

YANG Xiaochun, YU Jing, ZHANG Qing. Effects of chitosan on thermal stability of PVC[J]. China Plastics, 2022, 36(7): 68-73.

Figures/Tables 6

References 13

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样品	分子式	静态热稳定时间t/s
木糖醇	C₅H₁₂O₅	660
季戊四醇	C₅H₁₂O₄	570
甘露醇	C₆H₁₄O₆	590
1，1，1⁃三（羟甲基）乙烷	C₅H₁₂O₃	540
田菁胶	（C₁₇H₂₈O₁₆）_n	1 080
淀粉	（C₆H₁₀O₅）_n	720
壳聚糖	（C₆H₁₁NO₄）_n	4 020

样品	分子式	静态热稳定时间t/s
木糖醇	C₅H₁₂O₅	660
季戊四醇	C₅H₁₂O₄	570
甘露醇	C₆H₁₄O₆	590
1，1，1⁃三（羟甲基）乙烷	C₅H₁₂O₃	540
田菁胶	（C₁₇H₂₈O₁₆）_n	1 080
淀粉	（C₆H₁₀O₅）_n	720
壳聚糖	（C₆H₁₁NO₄）_n	4 020

稳定剂	热老化时间/min
稳定剂	5	10	15	20	25	30	35	40	45	50	60	70	80	90	100
壳聚糖
硬脂酸钙
硬脂酸锌
硬脂酸镧

稳定剂	热老化时间/min
稳定剂	5	10	15	20	25	30	35	40	45	50	60	70	80	90	100
壳聚糖
硬脂酸钙
硬脂酸锌
硬脂酸镧

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