Infectious Effect of Organic Small Molecules on Photo-oxidative Aging of Polypropylene

doi:10.7503/cjcu20200350

Abstract

Abstract:

Aging of a polymer is generally affected by adjacent polymers， known as infectious behavior of aging. Organic small molecules generated during aging are considered to be infection agents. However， the way they influence aging process and the difference among various infection agents are still unknown. In this paper， the influence of 18 representative organic small molecules on photo-oxidative aging of polypropylene（PP） was studied. The small molecules included acids， esters， aldehydes， ketones and alcohols， correspon-ding to typical photo-oxidative degradation products of polymers. When they were placed near PP during aging， the carbonyl index（CI） of PP was higher compared to the case when PP was aged individually. It was demonstrated that photo-oxidative aging of PP was accelerated by all the small molecules. The acceleration effects of acids， aldehydes and ketones were outstanding. Especially for propanoic acid， isobutyric acid， me- thacrylic acid， formaldehyde， acetaldehyde and butanone， CI was increased by more than 700% when PP was aged with them. Further， infection mechanism of acetone and acetic acid was investigated， since they had been identified as typical infection agents. CI and concentrations of gaseous degradation products of PP with and without acetone or acetic acid were measured with aging time. When PP was aged with acetone， CI was increased from as early as 24 h at an extremely high rate. With acetic acid， CI was increased after an obvious induction period and the increasing rate was lower than that with acetone. Similar phenomenon was observed in gaseous degradation products. The results showed that acetone acted as an initiator， photolyzed to generate CH₃· that could initiate the oxidation of PP； while acetic acid acted as a catalyzer， facilitating the decomposition of hydroperoxides and the accumulation of oxidation products.

Key words: Polypropylene, Photo-oxidative aging, Organic small molecule, Infection

CLC Number:

O631

TrendMD:

LIU Xuan, LIU Haoyu, LI Yifeng, ZHAO Jiaohong, YANG Rui. Infectious Effect of Organic Small Molecules on Photo-oxidative Aging of Polypropylene[J]. Chem. J. Chinese Universities, 2020, 41(12): 2838.

Figures/Tables 6

References 34

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Name(formula)	Mark	Category	Manufacturer
Formic acid(HCOOH)	FAC	Acid	Beijing Chemical Works
Acetic acid(CH₃COOH)	HAC		Beijing Tongguang Fine Chemicals Co. LTD
Propionic acid(CH₃CH₂COOH)	PAC		Tianjin Guangfu Fine Chemical Research Institute
Isobutyric acid[(CH₃)₂CHCOOH]	IAC		Sinopharm Group Chemical Reagent Co. LTD
Undecylenic acid[CH₂=CH(CH₂)₈COOH]	UAC		Beijing Jinlong Chemical Reagent Co. LTD
Acrylic acid(CH₂=CHCOOH)	AA		Tianjin Guangfu Fine Chemical Research Institute
Methacrylic acid[CH₂=C(CH₃)COOH]	MAA		Tianjin Bodi Chemical Co. LTD
Methyl acrylate(CH₂=CHCOOCH₃)	MA	Ester	Tianjin Fuchen Chemical Reagent Factory
Butyl acrylate[CH₂=CHCOO(CH₂)₃CH₃]	BA		Tianjin Institute of Chemical Reagents
Methyl methacrylate [CH₂=C(CH₃)COOCH₃]	MMA		Tianjin Institute of Chemical Reagents
Formaldehyde(HCHO)	FH	Aldehyde	Beijing Chemical Reagent Co. LTD
Acetaldehyde(CH₃CHO)	AH		Tianjin Fuchen Chemical Reagent Factory
Acetone(CH₃COCH₃)	CP	Ketone	Beijing Chemical Works
Butanone(CH₃COCH₂CH₃)	MEK		Beijing Chemical Works
Ethyl alcohol(CH₃CH₂OH)	EA	Alcohol	Beijing Tongguang Fine Chemicals Co. LTD
Isopropyl alcohol[(CH₃)₂CHOH]	IPA		Beijing Chemical Works
n?Pentyl alcohol[CH₃(CH₂)₄OH]	NPEA		Beijing Chemical Works
Isoamyl alcohol[CH₃CH(CH₃)(CH₂)₂OH]	IPEA		Beijing Chemical Works

Name(formula)	Mark	Category	Manufacturer
Formic acid(HCOOH)	FAC	Acid	Beijing Chemical Works
Acetic acid(CH₃COOH)	HAC		Beijing Tongguang Fine Chemicals Co. LTD
Propionic acid(CH₃CH₂COOH)	PAC		Tianjin Guangfu Fine Chemical Research Institute
Isobutyric acid[(CH₃)₂CHCOOH]	IAC		Sinopharm Group Chemical Reagent Co. LTD
Undecylenic acid[CH₂=CH(CH₂)₈COOH]	UAC		Beijing Jinlong Chemical Reagent Co. LTD
Acrylic acid(CH₂=CHCOOH)	AA		Tianjin Guangfu Fine Chemical Research Institute
Methacrylic acid[CH₂=C(CH₃)COOH]	MAA		Tianjin Bodi Chemical Co. LTD
Methyl acrylate(CH₂=CHCOOCH₃)	MA	Ester	Tianjin Fuchen Chemical Reagent Factory
Butyl acrylate[CH₂=CHCOO(CH₂)₃CH₃]	BA		Tianjin Institute of Chemical Reagents
Methyl methacrylate [CH₂=C(CH₃)COOCH₃]	MMA		Tianjin Institute of Chemical Reagents
Formaldehyde(HCHO)	FH	Aldehyde	Beijing Chemical Reagent Co. LTD
Acetaldehyde(CH₃CHO)	AH		Tianjin Fuchen Chemical Reagent Factory
Acetone(CH₃COCH₃)	CP	Ketone	Beijing Chemical Works
Butanone(CH₃COCH₂CH₃)	MEK		Beijing Chemical Works
Ethyl alcohol(CH₃CH₂OH)	EA	Alcohol	Beijing Tongguang Fine Chemicals Co. LTD
Isopropyl alcohol[(CH₃)₂CHOH]	IPA		Beijing Chemical Works
n?Pentyl alcohol[CH₃(CH₂)₄OH]	NPEA		Beijing Chemical Works
Isoamyl alcohol[CH₃CH(CH₃)(CH₂)₂OH]	IPEA		Beijing Chemical Works

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