Page 170 - CW E-Magazine (25-2-2025)

Special Report

enhance the dilute acid pre-treatment of C was carried out. Epoxidised product Cardanol-Piperidine (C-P)
sugarcane bagasse. becomes soluble in PVC. This plasticiser derivatives for enhanced
gives similar performance as di(2-ethyl- polypropylene resistance
A table gives in an exhaustive way hexyl)phthalate – a well-known pro-
examples of dilute acid pre-treatment duct. Mechanical properties are also against thermo- and photo-
with additive/carbocation scavenger for comparable. High yield of derivatives oxidative aging
enhancing cellulose bioconversion. of C is necessary to avoid free C. (Vinyl
There is a discussion on L extraction and Additive Technology, 2024; DOI: X. Zeng et al have synthesised three
C-P derivatives by using hydrogenated
pre-treatment and a table gives relevant 10.1002/vnl.21585). C and piperidine derivatives for the
details. Prevention of L repolymerisation One step beyond for CNSL- title objectives. These are ecofriendly
is covered, followed by L fractionation. based plasticisers for PVC: additives, compared to the existing
Examples of pre-treatment with additive/ Use of Cardol (C) common synthetic antioxidants. Their
carbocation scavenger and fermentation A. Gartilli et al have used C in place of properties were evaluated and found
of lignocellulose derived sugars are cardanol (due to the cost advantage) and to be useful. (Vinyl and Additive
covered. Technology, 2024; DOI: 10.1002/Vnl.
have used different fatty acids (octanoic 22113).
Enhanced L valorisation is discussed acid and myristic acid). Their endocrine
with improved L processability and a activity was also evaluated. Mechanical Synergistic effects of
table gives an exhaustive account. properties and thermal behaviours of epoxidised isosorbide (I)
PVC films was also evaluated. (Eur. Jl.
This review brings out most of the Lipid Sci. Technol., 2024; DOI: 10.1002/ linolenate (IL) (EGLA-ISB)
important issues on the title subject. There ejit.202400086).
are 69 references. (Chimia, 2023, 77, Y. Han et al have
No. 6, 403-416). reported a novel
Synthesis and characterisation bio-based heat sta-
biliser for enhanced
of high glycolic acid (GA) mechanical and ther-
content poly(glycolic acid- mal performance of
co-butylene adipate-co-butylene PVC. Such additives
terephthalate) and poly(glycolic resist thermal deg-
acid-co-butylene succinate) radation, prevent co-
copolymers with improved lour change, maintain
elasticity mechanical proper-
ties, and eliminate
A. Little et al have made the title biode- evolution of HCl gas
gradable polymer with high gas barrier during processing
properties, mechanical strength, and heat (common substances
deflection temperature. However, PGA’s are zinc/calcium stea-
brittleness severely limits its application rate). EGLA-ISB has
in packaging. Thus the title copolymers shown higher ther-
were made containing 21-92% GA with mal stability of PVC
M values of 46,700-50,600 g/mol. films when combined
w
Properties of different co-polymers with epoxidised soya-
are given. (ACS Omega, 2023; DOI: bean oil. The optical
10.1021/acsomega.3C05932). properties are also
Cardanol (C) based superior when incor-
plasticisers porating EGLA-ISB.
(Vinyl and Additive
C has to be subjected to modification to Technology, 2024;
make it suitable as a plasticiser for PVC. DOI: 10.1002/vnl.
Thus, acetylation and epoxidation of 22161).

170 Chemical Weekly February 25, 2025

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