Question

history of plastics
identify key dates in the history of plastics. mark them on the timeline and provide a brief
explanation for each event. annotate your timeline to recall three negative impacts that have
arisen over this time.

Explanation:

1. Key Dates & Events:

• 1855: Alexander Parkes invents Parkesine, the first man-made plastic, derived from cellulose; it was a moldable, semi-transparent material intended as an ivory substitute.
• 1907: Leo Baekeland creates Bakelite, the first fully synthetic plastic, which is heat-resistant and non-conductive, revolutionizing industrial and consumer goods manufacturing.
• 1950s: Mass production of polyethylene, polypropylene, and PET begins, driven by post-WWII industrial growth; these lightweight, low-cost plastics become ubiquitous in packaging and consumer products.
• 2000s: Global plastic production surpasses 200 million tons annually, with single-use plastics dominating markets, leading to widespread waste concerns.

1. Negative Impacts:

• Marine Pollution: Plastic waste accumulates in oceans, harming marine life via ingestion or entanglement, and forming large garbage patches.
• Soil & Ecosystem Degradation: Microplastics from broken-down plastics contaminate soil, disrupting soil structure and harming terrestrial organisms.
• Human Health Risks: Chemical additives in plastics (e.g., BPA) can leach into food/water, potentially causing hormonal disruptions and other health issues.

Answer:

Annotated Timeline:

Year	Event & Explanation
1907	Creation of Bakelite: First fully synthetic plastic, heat/chemical-resistant, industrial staple.
1950s	Mass production of polyethylene/polypropylene: Low-cost, lightweight plastics for packaging/consumer goods.
2000s	Global plastic production exceeds 200M tons/year: Single-use plastics drive waste crisis.

Key Negative Impacts:

1. Marine plastic pollution harming aquatic life
2. Microplastic contamination degrading soil ecosystems
3. Leached plastic chemicals posing human health risks