Preparation and Characterization of Long-acting Antimicrobial Polyethylene Terephthalate via Covalent Bonding Method†

doi:10.7503/cjcu20130935

Abstract

Abstract:

Polyhexamethylene guanidine hydrochloride(PHMG) was uesd to produce a long-acting antimicrobial polyethylene terephthalate(PET) masterbatch(PET-g-PHMG), which was obtained by covalently bonding 15% PHMG based on total weight onto PET matrix. Attributed to the higher grafting efficiency(93.7%), the hydrophilic PHGH is uniformly dispersed in PET matrix without any aggregate, which potentially enhances its antimicrobial activity. Several antimicrobial PET samples can be prepared by adding specific amount of PET-g-PHMG into the PET matrix. It was found that the addition of PET-g-PHMG did not cause the degradation of PET matrix, instead, increased the intrinsic viscosity because of the presence of some un-reactive functional groups in the PET-g-PHMG. The antimicrobial PET samples showed quickly and efficiently antimicrobial activity against both Gram-positive and Gram-negative bacteria. Furthermore, the antimicrobial activity of the antimicrobial PET fibers prepared by a spun-bonded method remained even after constant water washing for 10 d, indicating its long-acting antimicrobial ability via a contact activity rather than a release mechanism.

Key words: Polyethylene terephthalate, Covalent bonding, Long-acting antibacterial, Graft modification, Guanidine-based antimicrobial polymers polyhexamethylene guanidine hydrochloride

CLC Number:

O631

TrendMD:

ZHANG Qi, LU Suhui, ZHENG Anna, GUAN Yong, WEI Dafu, HUANG Tianhua, LI Shuzhao. Preparation and Characterization of Long-acting Antimicrobial Polyethylene Terephthalate via Covalent Bonding Method^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 873.

Figures/Tables 11

Scheme 1 Chemical structure of PHMG

Fig.1 1H NMR spectra of PHMG(A) and PHMG-e(B)

Scheme 2 Reaction scheme of producing PET-g-PHMG

Fig.2 Torque variations with time in Haake

Fig.3 FTIR spectra of PET/antibacterial masterbatch before and after extraction a. PET; b. PET-g-PHMG before extraction; c. PET-g-PHMG after extraction.

Fig.4 SEM images of fracture surface of PET/PHMG(A) and antibacterial PET with 1%PHMG(B)

Fig.5 TEM images of ultrathin section of PET/PHMG(A) and PET-g-PHMG(B)

Table 1 intrinsic viscosity test of PET samples

Sample	Content of antibacterial master batch(%)	PHMG content(%)	Processing temperature/℃	Intrinsic viscosity^*/(dL·g^-1)	Antibacterial rate(%)
Sample	Content of antibacterial master batch(%)	PHMG content(%)	Processing temperature/℃	Intrinsic viscosity^*/(dL·g^-1)	E.coli	S. aureus
PET		0	270	0.812	0	0
processed PET		0	270	0.694
PET-g-PHMG		15
PET-0.5	3.3	0.5	270	0.805	99.32	99.13
	3.3	0.5	300	0.725	99.02	99.17
PET-0.8	5.3	0.8	270	0.782	99.41	99.59
PET-1	6.7	1	270	0.749	99.94	99.98
PET/PHMG	0	1	270	0.579	61.59	36.11

Fig.6 Antibacterial performance of PET(A), PET/PHMG washed by water(B) and PET-0.5 washed by water(C) against Gram-Negative E.coli

Fig.7 Antibacterial performance against Gram-Negative E.coli of PET fibre(A) and antibcterial PET fibre(B)

Fig.8 Antimicrobial kinetics test of antimicrobial PET fibers against E.coli(a) and S.aureus(b)

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