LES 01 – NEW MATERIALS
Chapter 1: 1.1 Introduction to New Plastics: In this first chapter we look at
how plastics are being reconsidered within regenerative design. For decades
plastics were treated as cheap, inferior, and environmentally harmful
materials, mainly because they were fossil-based and difficult to recycle. But
regenerative architecture does not simply reject materials; instead, it
evaluates them based on their entire life cycle, their chemistry, and their
capacity to participate in circular systems. When we speak about “new
plastics,” we refer to materials that either come from renewable feedstocks,
have improved end-of-life pathways, or offer performance characteristics
that allow us to reduce mass, energy use, or maintenance in buildings. The
slides introduce three families: ETFE, polylactic acid (PLA), and thermoplastic
starch (TPS). Each represents a different strategy: high-performance
lightweight polymers, biobased compostable plastics, and biodegradable
starch-based materials. The goal is to understand how these materials
behave technically and environmentally so we can evaluate whether they
support regenerative indoor spaces.
1.2 Plastics Classification: The quadrant diagram in the slides is essential
because it corrects common misconceptions. Plastics can be fossil-based or
biobased, and they can be biodegradable or non-biodegradable. These axes
are independent. A biobased plastic such as biobased PET behaves almost
identically to fossil PET and is not biodegradable. Conversely, some
biodegradable plastics are still fossil-derived. This means that marketing
terms like “eco-plastic” or “green plastic” are meaningless without
understanding the underlying chemistry. In regenerative design we must
always ask: What is the feedstock? What is the degradation mechanism?
Under what conditions does degradation occur? What residues remain? Only
when we understand these factors can we judge whether a plastic supports
circularity or simply shifts environmental burdens elsewhere.
1.3 Biodegradable vs Compostable Plastics: The slides emphasise that
“biodegradable” is a vague and often misleading term. Every material
biodegrades eventually if you wait long enough, but that does not make it
environmentally safe. Biodegradation depends on temperature, humidity,
microbial activity, and oxygen availability. A plastic labelled “biodegradable”
may take decades to break down in soil or may not degrade at all in marine
,environments. Compostable plastics are a specific subset of biodegradable
plastics that must meet strict standards regarding time and environmental
conditions. Industrial composting typically requires temperatures above 55°C
and controlled humidity. This means that many compostable plastics will not
break down in a home compost or in nature. For regenerative design, this
distinction matters because we aim for materials that return safely to natural
cycles without leaving toxic residues or microplastics.
1.4 Oxo-Degradable Plastics: The slide with the crossed-out oxo-degradable
category makes a strong point: these materials are not regenerative.
Oxo-degradable plastics are conventional fossil plastics mixed with additives
that accelerate fragmentation. They do not biodegrade at the molecular
level; instead, they break into microplastics that persist indefinitely. This is
worse than conventional plastics because it increases the spread of
microplastic pollution. From a regenerative perspective, oxo-degradables fail
completely: they do not support circularity, they contaminate ecosystems,
and they cannot be composted or safely recycled.
1.5 Bioplastic vs Biodegradable Plastic: The comparison slide clarifies two
important categories. Bioplastics such as PLA or starch blends are produced
from renewable feedstocks like corn starch, food waste, or wood chips. They
can be compostable and recyclable, and when they break down, the CO₂
released is part of the short carbon cycle. Biodegradable plastics, on the
other hand, may still be petroleum-based and rely on additives to accelerate
breakdown. These can leave toxic residues. The key message is that
biobased does not automatically mean biodegradable, and biodegradable
does not automatically mean compostable. Regenerative design requires
precise understanding of material chemistry and end-of-life behaviour.
First material of the new plastic: ETFE — Ethylene Tetrafluoroethylene:
ETFE is the most important case study in this chapter because it is widely
used in contemporary architecture and raises complex questions about
sustainability, performance, and regenerative potential.
1.6.1 What ETFE Is and Why It Matters: ETFE is a fluoropolymer originally
developed by DuPont in the 1970s for aerospace insulation. Architecture
adopted it later, first in greenhouses and photovoltaic protection, and
eventually in large-scale public buildings. The key reason architects became
interested in ETFE is its extremely high light transmission combined with
very low weight. A single ETFE layer weighs about 1% of the weight of glass.
2
, This allows large spans, reduced structural mass, and expressive forms that
would be impossible with conventional glazing. In regenerative design,
reducing material mass and embodied energy is a major advantage. ETFE
also has a long lifespan, excellent UV resistance, and minimal maintenance
requirements, which further reduces operational impacts.
1.6.2 ETFE Synthesis and Production: The slides show the chemical pathway:
fluorite (CaF₂) is combined with trichloromethane and hydrogen sulphate,
pyrolysed to produce chlorotrifluoroethylene, and then polymerised with
ethylene to form ETFE. The important point is that ETFE is classified as a
Class II substance under the Montreal Protocol, meaning it does not
contribute to ozone depletion. The production process uses no solvents and
is water-based, which reduces environmental impact. Extrusion into foil
requires relatively low energy, and fabrication involves welding sheets into
cushions. Production waste can be recycled back into the process. This
positions ETFE as a high-performance polymer with a relatively clean
manufacturing chain compared to many conventional plastics.
1.6.3 Applications: ETFE is used in three main sectors: automotive,
construction, and chemical industries. In construction, it is especially valued
for roofs, façades, and large-span enclosures. Its durability, translucency,
and formability make it ideal for stadiums, botanical gardens, and atria.
Because it can be rolled, transportation impacts are low. Its resistance to
chemicals and radiation also makes it suitable for industrial environments. In
regenerative design, ETFE’s lightweight nature reduces structural steel
requirements, lowering embodied carbon.
1.6.4 Advantages in Construction: The slides list several key advantages:
extraordinary tear resistance, long lifespan (20+ years), 100% recyclability,
UV transparency, and excellent electrical properties. The low weight reduces
structural loads dramatically. ETFE is also self-cleaning due to its non-stick
surface, meaning rainwater removes dirt and maintenance is minimal. This
reduces operational energy and avoids chemical cleaning agents. ETFE’s UV
transparency supports plant growth and daylighting, which can reduce
artificial lighting loads in indoor environments.
1.6.5 Disadvantages: ETFE is not a natural material, and its initial cost is
higher than glass. It is acoustically transparent, meaning it transmits sound
easily and can amplify rain noise. Cushions require continuous inflation,
which means energy consumption and mechanical maintenance. These
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Chapter 1: 1.1 Introduction to New Plastics: In this first chapter we look at
how plastics are being reconsidered within regenerative design. For decades
plastics were treated as cheap, inferior, and environmentally harmful
materials, mainly because they were fossil-based and difficult to recycle. But
regenerative architecture does not simply reject materials; instead, it
evaluates them based on their entire life cycle, their chemistry, and their
capacity to participate in circular systems. When we speak about “new
plastics,” we refer to materials that either come from renewable feedstocks,
have improved end-of-life pathways, or offer performance characteristics
that allow us to reduce mass, energy use, or maintenance in buildings. The
slides introduce three families: ETFE, polylactic acid (PLA), and thermoplastic
starch (TPS). Each represents a different strategy: high-performance
lightweight polymers, biobased compostable plastics, and biodegradable
starch-based materials. The goal is to understand how these materials
behave technically and environmentally so we can evaluate whether they
support regenerative indoor spaces.
1.2 Plastics Classification: The quadrant diagram in the slides is essential
because it corrects common misconceptions. Plastics can be fossil-based or
biobased, and they can be biodegradable or non-biodegradable. These axes
are independent. A biobased plastic such as biobased PET behaves almost
identically to fossil PET and is not biodegradable. Conversely, some
biodegradable plastics are still fossil-derived. This means that marketing
terms like “eco-plastic” or “green plastic” are meaningless without
understanding the underlying chemistry. In regenerative design we must
always ask: What is the feedstock? What is the degradation mechanism?
Under what conditions does degradation occur? What residues remain? Only
when we understand these factors can we judge whether a plastic supports
circularity or simply shifts environmental burdens elsewhere.
1.3 Biodegradable vs Compostable Plastics: The slides emphasise that
“biodegradable” is a vague and often misleading term. Every material
biodegrades eventually if you wait long enough, but that does not make it
environmentally safe. Biodegradation depends on temperature, humidity,
microbial activity, and oxygen availability. A plastic labelled “biodegradable”
may take decades to break down in soil or may not degrade at all in marine
,environments. Compostable plastics are a specific subset of biodegradable
plastics that must meet strict standards regarding time and environmental
conditions. Industrial composting typically requires temperatures above 55°C
and controlled humidity. This means that many compostable plastics will not
break down in a home compost or in nature. For regenerative design, this
distinction matters because we aim for materials that return safely to natural
cycles without leaving toxic residues or microplastics.
1.4 Oxo-Degradable Plastics: The slide with the crossed-out oxo-degradable
category makes a strong point: these materials are not regenerative.
Oxo-degradable plastics are conventional fossil plastics mixed with additives
that accelerate fragmentation. They do not biodegrade at the molecular
level; instead, they break into microplastics that persist indefinitely. This is
worse than conventional plastics because it increases the spread of
microplastic pollution. From a regenerative perspective, oxo-degradables fail
completely: they do not support circularity, they contaminate ecosystems,
and they cannot be composted or safely recycled.
1.5 Bioplastic vs Biodegradable Plastic: The comparison slide clarifies two
important categories. Bioplastics such as PLA or starch blends are produced
from renewable feedstocks like corn starch, food waste, or wood chips. They
can be compostable and recyclable, and when they break down, the CO₂
released is part of the short carbon cycle. Biodegradable plastics, on the
other hand, may still be petroleum-based and rely on additives to accelerate
breakdown. These can leave toxic residues. The key message is that
biobased does not automatically mean biodegradable, and biodegradable
does not automatically mean compostable. Regenerative design requires
precise understanding of material chemistry and end-of-life behaviour.
First material of the new plastic: ETFE — Ethylene Tetrafluoroethylene:
ETFE is the most important case study in this chapter because it is widely
used in contemporary architecture and raises complex questions about
sustainability, performance, and regenerative potential.
1.6.1 What ETFE Is and Why It Matters: ETFE is a fluoropolymer originally
developed by DuPont in the 1970s for aerospace insulation. Architecture
adopted it later, first in greenhouses and photovoltaic protection, and
eventually in large-scale public buildings. The key reason architects became
interested in ETFE is its extremely high light transmission combined with
very low weight. A single ETFE layer weighs about 1% of the weight of glass.
2
, This allows large spans, reduced structural mass, and expressive forms that
would be impossible with conventional glazing. In regenerative design,
reducing material mass and embodied energy is a major advantage. ETFE
also has a long lifespan, excellent UV resistance, and minimal maintenance
requirements, which further reduces operational impacts.
1.6.2 ETFE Synthesis and Production: The slides show the chemical pathway:
fluorite (CaF₂) is combined with trichloromethane and hydrogen sulphate,
pyrolysed to produce chlorotrifluoroethylene, and then polymerised with
ethylene to form ETFE. The important point is that ETFE is classified as a
Class II substance under the Montreal Protocol, meaning it does not
contribute to ozone depletion. The production process uses no solvents and
is water-based, which reduces environmental impact. Extrusion into foil
requires relatively low energy, and fabrication involves welding sheets into
cushions. Production waste can be recycled back into the process. This
positions ETFE as a high-performance polymer with a relatively clean
manufacturing chain compared to many conventional plastics.
1.6.3 Applications: ETFE is used in three main sectors: automotive,
construction, and chemical industries. In construction, it is especially valued
for roofs, façades, and large-span enclosures. Its durability, translucency,
and formability make it ideal for stadiums, botanical gardens, and atria.
Because it can be rolled, transportation impacts are low. Its resistance to
chemicals and radiation also makes it suitable for industrial environments. In
regenerative design, ETFE’s lightweight nature reduces structural steel
requirements, lowering embodied carbon.
1.6.4 Advantages in Construction: The slides list several key advantages:
extraordinary tear resistance, long lifespan (20+ years), 100% recyclability,
UV transparency, and excellent electrical properties. The low weight reduces
structural loads dramatically. ETFE is also self-cleaning due to its non-stick
surface, meaning rainwater removes dirt and maintenance is minimal. This
reduces operational energy and avoids chemical cleaning agents. ETFE’s UV
transparency supports plant growth and daylighting, which can reduce
artificial lighting loads in indoor environments.
1.6.5 Disadvantages: ETFE is not a natural material, and its initial cost is
higher than glass. It is acoustically transparent, meaning it transmits sound
easily and can amplify rain noise. Cushions require continuous inflation,
which means energy consumption and mechanical maintenance. These
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